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Anonymous
x/2 + 10 = 30 is a linear equation in one variable, x.
Although not requested, the solution is as follows:
Subtract 10 from bothe sides: x/2 = 20
Multiply both sides by 2: x = 40
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30
30/0.5 + 10 = 70
if by thrity equals you mean straight up 30, then the answer is 10.
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40