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21+4x=2(-x+6)-27
We move all terms to the left:
21+4x-(2(-x+6)-27)=0
We add all the numbers together, and all the variables
4x-(2(-1x+6)-27)+21=0
We calculate terms in parentheses: -(2(-1x+6)-27), so:We get rid of parentheses
2(-1x+6)-27
We multiply parentheses
-2x+12-27
We add all the numbers together, and all the variables
-2x-15
Back to the equation:
-(-2x-15)
4x+2x+15+21=0
We add all the numbers together, and all the variables
6x+36=0
We move all terms containing x to the left, all other terms to the right
6x=-36
x=-36/6
x=-6
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