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30=-6x-3(-3x-5)
We move all terms to the left:
30-(-6x-3(-3x-5))=0
We calculate terms in parentheses: -(-6x-3(-3x-5)), so:We get rid of parentheses
-6x-3(-3x-5)
We multiply parentheses
-6x+9x+15
We add all the numbers together, and all the variables
3x+15
Back to the equation:
-(3x+15)
-3x-15+30=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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