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