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210=3x+3(5x+10)
We move all terms to the left:
210-(3x+3(5x+10))=0
We calculate terms in parentheses: -(3x+3(5x+10)), so:We get rid of parentheses
3x+3(5x+10)
We multiply parentheses
3x+15x+30
We add all the numbers together, and all the variables
18x+30
Back to the equation:
-(18x+30)
-18x-30+210=0
We add all the numbers together, and all the variables
-18x+180=0
We move all terms containing x to the left, all other terms to the right
-18x=-180
x=-180/-18
x=+10
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