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-3.5x+9-(12x-60)-(-30)+12.5=210-3.5x+9-12x+60-30+12.5x=210
We move all terms to the left:
-3.5x+9-(12x-60)-(-30)+12.5-(210-3.5x+9-12x+60-30+12.5x)=0
We add all the numbers together, and all the variables
-3.5x-(12x-60)-(-3x+249)+9+12.5-(-30)=0
We add all the numbers together, and all the variables
-3.5x-(12x-60)-(-3x+249)+51.5=0
We get rid of parentheses
-3.5x-12x+3x+60-249+51.5=0
We add all the numbers together, and all the variables
-12.5x-137.5=0
We move all terms containing x to the left, all other terms to the right
-12.5x=137.5
x=137.5/-12.5
x=-11
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