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3x+13=3(x+6)+13x+13=3(x+6)+1
We move all terms to the left:
3x+13-(3(x+6)+13x+13)=0
We calculate terms in parentheses: -(3(x+6)+13x+13), so:We get rid of parentheses
3(x+6)+13x+13
We add all the numbers together, and all the variables
13x+3(x+6)+13
We multiply parentheses
13x+3x+18+13
We add all the numbers together, and all the variables
16x+31
Back to the equation:
-(16x+31)
3x-16x-31+13=0
We add all the numbers together, and all the variables
-13x-18=0
We move all terms containing x to the left, all other terms to the right
-13x=18
x=18/-13
x=-1+5/13
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