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-21-4x=3(6x+7)
We move all terms to the left:
-21-4x-(3(6x+7))=0
We calculate terms in parentheses: -(3(6x+7)), so:We get rid of parentheses
3(6x+7)
We multiply parentheses
18x+21
Back to the equation:
-(18x+21)
-4x-18x-21-21=0
We add all the numbers together, and all the variables
-22x-42=0
We move all terms containing x to the left, all other terms to the right
-22x=42
x=42/-22
x=-1+10/11
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