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7=2(j+1)-13
We move all terms to the left:
7-(2(j+1)-13)=0
We calculate terms in parentheses: -(2(j+1)-13), so:We get rid of parentheses
2(j+1)-13
We multiply parentheses
2j+2-13
We add all the numbers together, and all the variables
2j-11
Back to the equation:
-(2j-11)
-2j+11+7=0
We add all the numbers together, and all the variables
-2j+18=0
We move all terms containing j to the left, all other terms to the right
-2j=-18
j=-18/-2
j=+9
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