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6x+21=-100-5x
We move all terms to the left:
6x+21-(-100-5x)=0
We add all the numbers together, and all the variables
6x-(-5x-100)+21=0
We get rid of parentheses
6x+5x+100+21=0
We add all the numbers together, and all the variables
11x+121=0
We move all terms containing x to the left, all other terms to the right
11x=-121
x=-121/11
x=-11
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