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x-2x(12-12)=2(4-2x)+20
We move all terms to the left:
x-2x(12-12)-(2(4-2x)+20)=0
We add all the numbers together, and all the variables
x-2x0-(2(-2x+4)+20)=0
We add all the numbers together, and all the variables
-1x-(2(-2x+4)+20)=0
We calculate terms in parentheses: -(2(-2x+4)+20), so:We get rid of parentheses
2(-2x+4)+20
We multiply parentheses
-4x+8+20
We add all the numbers together, and all the variables
-4x+28
Back to the equation:
-(-4x+28)
-1x+4x-28=0
We add all the numbers together, and all the variables
3x-28=0
We move all terms containing x to the left, all other terms to the right
3x=28
x=28/3
x=9+1/3
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