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40x-900=-5x+900
We move all terms to the left:
40x-900-(-5x+900)=0
We get rid of parentheses
40x+5x-900-900=0
We add all the numbers together, and all the variables
45x-1800=0
We move all terms containing x to the left, all other terms to the right
45x=1800
x=1800/45
x=40
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