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11x+5=-21-2x
We move all terms to the left:
11x+5-(-21-2x)=0
We add all the numbers together, and all the variables
11x-(-2x-21)+5=0
We get rid of parentheses
11x+2x+21+5=0
We add all the numbers together, and all the variables
13x+26=0
We move all terms containing x to the left, all other terms to the right
13x=-26
x=-26/13
x=-2
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