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7x+40=-3x
We move all terms to the left:
7x+40-(-3x)=0
We get rid of parentheses
7x+3x+40=0
We add all the numbers together, and all the variables
10x+40=0
We move all terms containing x to the left, all other terms to the right
10x=-40
x=-40/10
x=-4
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