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3x+2(-4x+12)=13.5
We move all terms to the left:
3x+2(-4x+12)-(13.5)=0
We add all the numbers together, and all the variables
3x+2(-4x+12)-13.5=0
We multiply parentheses
3x-8x+24-13.5=0
We add all the numbers together, and all the variables
-5x+10.5=0
We move all terms containing x to the left, all other terms to the right
-5x=-10.5
x=-10.5/-5
x=2+0.5/5
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