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(9x+210)=(4x+140)
We move all terms to the left:
(9x+210)-((4x+140))=0
We get rid of parentheses
9x-((4x+140))+210=0
We calculate terms in parentheses: -((4x+140)), so:We get rid of parentheses
(4x+140)
We get rid of parentheses
4x+140
Back to the equation:
-(4x+140)
9x-4x-140+210=0
We add all the numbers together, and all the variables
5x+70=0
We move all terms containing x to the left, all other terms to the right
5x=-70
x=-70/5
x=-14
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