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4x+12=-5-15
We move all terms to the left:
4x+12-(-5-15)=0
We add all the numbers together, and all the variables
4x+12-(-20)=0
We add all the numbers together, and all the variables
4x+32=0
We move all terms containing x to the left, all other terms to the right
4x=-32
x=-32/4
x=-8
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