21=3(x+2)-5x+9

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Solution for 21=3(x+2)-5x+9 equation:



21=3(x+2)-5x+9
We move all terms to the left:
21-(3(x+2)-5x+9)=0
We calculate terms in parentheses: -(3(x+2)-5x+9), so:
3(x+2)-5x+9
We add all the numbers together, and all the variables
-5x+3(x+2)+9
We multiply parentheses
-5x+3x+6+9
We add all the numbers together, and all the variables
-2x+15
Back to the equation:
-(-2x+15)
We get rid of parentheses
2x-15+21=0
We add all the numbers together, and all the variables
2x+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3

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