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4x+(x+7)=-21-2x
We move all terms to the left:
4x+(x+7)-(-21-2x)=0
We add all the numbers together, and all the variables
4x+(x+7)-(-2x-21)=0
We get rid of parentheses
4x+x+2x+7+21=0
We add all the numbers together, and all the variables
7x+28=0
We move all terms containing x to the left, all other terms to the right
7x=-28
x=-28/7
x=-4
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