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-90=-2(3x+5)+4x
We move all terms to the left:
-90-(-2(3x+5)+4x)=0
We calculate terms in parentheses: -(-2(3x+5)+4x), so:We get rid of parentheses
-2(3x+5)+4x
We add all the numbers together, and all the variables
4x-2(3x+5)
We multiply parentheses
4x-6x-10
We add all the numbers together, and all the variables
-2x-10
Back to the equation:
-(-2x-10)
2x+10-90=0
We add all the numbers together, and all the variables
2x-80=0
We move all terms containing x to the left, all other terms to the right
2x=80
x=80/2
x=40
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