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140=4(x-10)
We move all terms to the left:
140-(4(x-10))=0
We calculate terms in parentheses: -(4(x-10)), so:We get rid of parentheses
4(x-10)
We multiply parentheses
4x-40
Back to the equation:
-(4x-40)
-4x+40+140=0
We add all the numbers together, and all the variables
-4x+180=0
We move all terms containing x to the left, all other terms to the right
-4x=-180
x=-180/-4
x=+45
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