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12+1x=-3(4-1x)
We move all terms to the left:
12+1x-(-3(4-1x))=0
We add all the numbers together, and all the variables
1x-(-3(-1x+4))+12=0
We add all the numbers together, and all the variables
x-(-3(-1x+4))+12=0
We calculate terms in parentheses: -(-3(-1x+4)), so:We get rid of parentheses
-3(-1x+4)
We multiply parentheses
3x-12
Back to the equation:
-(3x-12)
x-3x+12+12=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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