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2(x-30)-x+40=4(x-50)
We move all terms to the left:
2(x-30)-x+40-(4(x-50))=0
We add all the numbers together, and all the variables
-1x+2(x-30)-(4(x-50))+40=0
We multiply parentheses
-1x+2x-(4(x-50))-60+40=0
We calculate terms in parentheses: -(4(x-50)), so:We add all the numbers together, and all the variables
4(x-50)
We multiply parentheses
4x-200
Back to the equation:
-(4x-200)
x-(4x-200)-20=0
We get rid of parentheses
x-4x+200-20=0
We add all the numbers together, and all the variables
-3x+180=0
We move all terms containing x to the left, all other terms to the right
-3x=-180
x=-180/-3
x=+60
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