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-3x+3(-4x+8)=144
We move all terms to the left:
-3x+3(-4x+8)-(144)=0
We multiply parentheses
-3x-12x+24-144=0
We add all the numbers together, and all the variables
-15x-120=0
We move all terms containing x to the left, all other terms to the right
-15x=120
x=120/-15
x=-8
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