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2100=35(2x-12)
We move all terms to the left:
2100-(35(2x-12))=0
We calculate terms in parentheses: -(35(2x-12)), so:We get rid of parentheses
35(2x-12)
We multiply parentheses
70x-420
Back to the equation:
-(70x-420)
-70x+420+2100=0
We add all the numbers together, and all the variables
-70x+2520=0
We move all terms containing x to the left, all other terms to the right
-70x=-2520
x=-2520/-70
x=+36
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