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4(5+x)-6(12+x)=4
We move all terms to the left:
4(5+x)-6(12+x)-(4)=0
We add all the numbers together, and all the variables
4(x+5)-6(x+12)-4=0
We multiply parentheses
4x-6x+20-72-4=0
We add all the numbers together, and all the variables
-2x-56=0
We move all terms containing x to the left, all other terms to the right
-2x=56
x=56/-2
x=-28
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