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2(1-9x)=4(7-5x)
We move all terms to the left:
2(1-9x)-(4(7-5x))=0
We add all the numbers together, and all the variables
2(-9x+1)-(4(-5x+7))=0
We multiply parentheses
-18x-(4(-5x+7))+2=0
We calculate terms in parentheses: -(4(-5x+7)), so:We get rid of parentheses
4(-5x+7)
We multiply parentheses
-20x+28
Back to the equation:
-(-20x+28)
-18x+20x-28+2=0
We add all the numbers together, and all the variables
2x-26=0
We move all terms containing x to the left, all other terms to the right
2x=26
x=26/2
x=13
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