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2(-x+3x)+3(-x)+7=(-x)+-3x(-3)
We move all terms to the left:
2(-x+3x)+3(-x)+7-((-x)+-3x(-3))=0
We add all the numbers together, and all the variables
2(+2x)+3(-1x)-((-1x)+-3x(-3))+7=0
We use the square of the difference formula
2(+2x)+3(-1x)-((-1x)-3x(-3))+7=0
We multiply parentheses
4x-3x-((-1x)-3x(-3))+7=0
We calculate terms in parentheses: -((-1x)-3x(-3)), so:We add all the numbers together, and all the variables
(-1x)-3x(-3)
We multiply parentheses
(-1x)+9x
We get rid of parentheses
-1x+9x
We add all the numbers together, and all the variables
8x
Back to the equation:
-(8x)
-7x+7=0
We move all terms containing x to the left, all other terms to the right
-7x=-7
x=-7/-7
x=1
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