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2x-30+5x=5(x-4)
We move all terms to the left:
2x-30+5x-(5(x-4))=0
We add all the numbers together, and all the variables
7x-(5(x-4))-30=0
We calculate terms in parentheses: -(5(x-4)), so:We get rid of parentheses
5(x-4)
We multiply parentheses
5x-20
Back to the equation:
-(5x-20)
7x-5x+20-30=0
We add all the numbers together, and all the variables
2x-10=0
We move all terms containing x to the left, all other terms to the right
2x=10
x=10/2
x=5
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