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12x-4x=-25-21
We move all terms to the left:
12x-4x-(-25-21)=0
We add all the numbers together, and all the variables
12x-4x-(-46)=0
We add all the numbers together, and all the variables
8x+46=0
We move all terms containing x to the left, all other terms to the right
8x=-46
x=-46/8
x=-5+3/4
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