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6(90-x)=2(180-x)-12
We move all terms to the left:
6(90-x)-(2(180-x)-12)=0
We add all the numbers together, and all the variables
6(-1x+90)-(2(-1x+180)-12)=0
We multiply parentheses
-6x-(2(-1x+180)-12)+540=0
We calculate terms in parentheses: -(2(-1x+180)-12), so:We get rid of parentheses
2(-1x+180)-12
We multiply parentheses
-2x+360-12
We add all the numbers together, and all the variables
-2x+348
Back to the equation:
-(-2x+348)
-6x+2x-348+540=0
We add all the numbers together, and all the variables
-4x+192=0
We move all terms containing x to the left, all other terms to the right
-4x=-192
x=-192/-4
x=+48
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