-21=3(2x+5)

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Solution for -21=3(2x+5) equation:



-21=3(2x+5)
We move all terms to the left:
-21-(3(2x+5))=0
We calculate terms in parentheses: -(3(2x+5)), so:
3(2x+5)
We multiply parentheses
6x+15
Back to the equation:
-(6x+15)
We get rid of parentheses
-6x-15-21=0
We add all the numbers together, and all the variables
-6x-36=0
We move all terms containing x to the left, all other terms to the right
-6x=36
x=36/-6
x=-6

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