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180-x=3(90-x)-4
We move all terms to the left:
180-x-(3(90-x)-4)=0
We add all the numbers together, and all the variables
-x-(3(-1x+90)-4)+180=0
We add all the numbers together, and all the variables
-1x-(3(-1x+90)-4)+180=0
We calculate terms in parentheses: -(3(-1x+90)-4), so:We get rid of parentheses
3(-1x+90)-4
We multiply parentheses
-3x+270-4
We add all the numbers together, and all the variables
-3x+266
Back to the equation:
-(-3x+266)
-1x+3x-266+180=0
We add all the numbers together, and all the variables
2x-86=0
We move all terms containing x to the left, all other terms to the right
2x=86
x=86/2
x=43
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