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12x-3=(3-4)x
We move all terms to the left:
12x-3-((3-4)x)=0
We add all the numbers together, and all the variables
12x-((-1)x)-3=0
We calculate terms in parentheses: -((-1)x), so:We add all the numbers together, and all the variables
(-1)x
We multiply parentheses
-x
Back to the equation:
-(-x)
12x-(-1x)-3=0
We get rid of parentheses
12x+1x-3=0
We add all the numbers together, and all the variables
13x-3=0
We move all terms containing x to the left, all other terms to the right
13x=3
x=3/13
x=3/13
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