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25+8x-3(x-12)=4
We move all terms to the left:
25+8x-3(x-12)-(4)=0
We add all the numbers together, and all the variables
8x-3(x-12)+21=0
We multiply parentheses
8x-3x+36+21=0
We add all the numbers together, and all the variables
5x+57=0
We move all terms containing x to the left, all other terms to the right
5x=-57
x=-57/5
x=-11+2/5
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