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x-40=2(2x-5)
We move all terms to the left:
x-40-(2(2x-5))=0
We calculate terms in parentheses: -(2(2x-5)), so:We get rid of parentheses
2(2x-5)
We multiply parentheses
4x-10
Back to the equation:
-(4x-10)
x-4x+10-40=0
We add all the numbers together, and all the variables
-3x-30=0
We move all terms containing x to the left, all other terms to the right
-3x=30
x=30/-3
x=-10
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