[addition property][section 7]

(1.) x + 7 = 13 here is the problem

-7 -7 subtract 7 from each side
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x = 6 subtract

result: x = 6

(2.) 8 + n = 5 here is the problem

-8 -8 subtract 8 from each side
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n = -3 subtract

result: n = -3

(3.) y - 4 = 13 here is the problem

+4 +4 add 4 to each side
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y = 17 add

result: y = 17

(4.) 3 + y = 17 here is the problem

-3 -3 subtract 3 from each side
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y = 14 subtract

result: y = 14

(5.) -8 + z = 30 here is the problem

+ 8 + 8 add 8 to each side
_____________
z = 38 add

result: z = 38

(6.) -12 + z = 1 here is the problem

+ 12 +12 add 12 to each side
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z = 13 add

result: z = 13

(7.) m + 3 = 1 here is the problem

-3 -3 subtract 3 from each side
________________
m = -2 subtract

result: m = -2

(8.) r + 9 = -19 here is the problem

-9 -9 subtract 9 from each side
_________________
r = -28 subtract

result: r = -28

(9.) -8 + t = -13 here is the problem

+ 8 +8 add 8 to each side
_________________
t = -5 add

result: t = -5

(10.) z - 1.6 = 2 here is the problem

+ 1.6 +1.6 add 1.6 to each side
__________________
z = 3.6 add

result: z = 3.6