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10=(-3x)+40
We move all terms to the left:
10-((-3x)+40)=0
We calculate terms in parentheses: -((-3x)+40), so:We get rid of parentheses
(-3x)+40
We get rid of parentheses
-3x+40
Back to the equation:
-(-3x+40)
3x-40+10=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10
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