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30=3(x+7)
We move all terms to the left:
30-(3(x+7))=0
We calculate terms in parentheses: -(3(x+7)), so:We get rid of parentheses
3(x+7)
We multiply parentheses
3x+21
Back to the equation:
-(3x+21)
-3x-21+30=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3
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