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-7=13x-5(1+3x)
We move all terms to the left:
-7-(13x-5(1+3x))=0
We add all the numbers together, and all the variables
-(13x-5(3x+1))-7=0
We calculate terms in parentheses: -(13x-5(3x+1)), so:We get rid of parentheses
13x-5(3x+1)
We multiply parentheses
13x-15x-5
We add all the numbers together, and all the variables
-2x-5
Back to the equation:
-(-2x-5)
2x+5-7=0
We add all the numbers together, and all the variables
2x-2=0
We move all terms containing x to the left, all other terms to the right
2x=2
x=2/2
x=1
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