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70+.5x=50+.9x
We move all terms to the left:
70+.5x-(50+.9x)=0
We add all the numbers together, and all the variables
.5x-(.9x+50)+70=0
We get rid of parentheses
.5x-.9x-50+70=0
We add all the numbers together, and all the variables
-0.4x+20=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-20
x=-20/-0.4
x=+50
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