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21-7x=-15+2x
We move all terms to the left:
21-7x-(-15+2x)=0
We add all the numbers together, and all the variables
-7x-(2x-15)+21=0
We get rid of parentheses
-7x-2x+15+21=0
We add all the numbers together, and all the variables
-9x+36=0
We move all terms containing x to the left, all other terms to the right
-9x=-36
x=-36/-9
x=+4
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