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4x+5(-5x-12)=-165
We move all terms to the left:
4x+5(-5x-12)-(-165)=0
We add all the numbers together, and all the variables
4x+5(-5x-12)+165=0
We multiply parentheses
4x-25x-60+165=0
We add all the numbers together, and all the variables
-21x+105=0
We move all terms containing x to the left, all other terms to the right
-21x=-105
x=-105/-21
x=+5
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