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12.3+7.5x=-15.2+2x
We move all terms to the left:
12.3+7.5x-(-15.2+2x)=0
We add all the numbers together, and all the variables
7.5x-(2x-15.2)+12.3=0
We get rid of parentheses
7.5x-2x+15.2+12.3=0
We add all the numbers together, and all the variables
5.5x+27.5=0
We move all terms containing x to the left, all other terms to the right
5.5x=-27.5
x=-27.5/5.5
x=-5
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