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133=-7x-3(-5x-15)
We move all terms to the left:
133-(-7x-3(-5x-15))=0
We calculate terms in parentheses: -(-7x-3(-5x-15)), so:We get rid of parentheses
-7x-3(-5x-15)
We multiply parentheses
-7x+15x+45
We add all the numbers together, and all the variables
8x+45
Back to the equation:
-(8x+45)
-8x-45+133=0
We add all the numbers together, and all the variables
-8x+88=0
We move all terms containing x to the left, all other terms to the right
-8x=-88
x=-88/-8
x=+11
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