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4x-12=3(10-x)
We move all terms to the left:
4x-12-(3(10-x))=0
We add all the numbers together, and all the variables
4x-(3(-1x+10))-12=0
We calculate terms in parentheses: -(3(-1x+10)), so:We get rid of parentheses
3(-1x+10)
We multiply parentheses
-3x+30
Back to the equation:
-(-3x+30)
4x+3x-30-12=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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