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3-(7+x)=(-3x)
We move all terms to the left:
3-(7+x)-((-3x))=0
We add all the numbers together, and all the variables
-(x+7)-((-3x))+3=0
We get rid of parentheses
-x-((-3x))-7+3=0
We calculate terms in parentheses: -((-3x)), so:We add all the numbers together, and all the variables
(-3x)
We get rid of parentheses
-3x
Back to the equation:
-(-3x)
-1x-(-3x)-4=0
We get rid of parentheses
-1x+3x-4=0
We add all the numbers together, and all the variables
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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