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90x-70=2.50x+70-x.12/20
We move all terms to the left:
90x-70-(2.50x+70-x.12/20)=0
We add all the numbers together, and all the variables
90x-(2.50x-x.12/20+70)-70=0
We get rid of parentheses
90x-2.50x+x.12/20-70-70=0
We multiply all the terms by the denominator
90x*20-(2.50x)*20+x.12-70*20-70*20=0
We add all the numbers together, and all the variables
90x*20-(+2.50x)*20+x.12-70*20-70*20=0
We add all the numbers together, and all the variables
90x*20-(+2.50x)*20+x.12-2800=0
We multiply parentheses
90x*20-40x+x.12-2800=0
Wy multiply elements
1800x-40x+x.12-2800=0
We add all the numbers together, and all the variables
1760x+x.12-2800=0
We move all terms containing x to the left, all other terms to the right
1760x+x.12=2800
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