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15=30-0.5x
We move all terms to the left:
15-(30-0.5x)=0
We add all the numbers together, and all the variables
-(-0.5x+30)+15=0
We get rid of parentheses
0.5x-30+15=0
We add all the numbers together, and all the variables
0.5x-15=0
We move all terms containing x to the left, all other terms to the right
0.5x=15
x=15/0.5
x=30
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