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40x-35=5x+3+20x+7
We move all terms to the left:
40x-35-(5x+3+20x+7)=0
We add all the numbers together, and all the variables
40x-(25x+10)-35=0
We get rid of parentheses
40x-25x-10-35=0
We add all the numbers together, and all the variables
15x-45=0
We move all terms containing x to the left, all other terms to the right
15x=45
x=45/15
x=3
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