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-87=7k-5(3-k)
We move all terms to the left:
-87-(7k-5(3-k))=0
We add all the numbers together, and all the variables
-(7k-5(-1k+3))-87=0
We calculate terms in parentheses: -(7k-5(-1k+3)), so:We get rid of parentheses
7k-5(-1k+3)
We multiply parentheses
7k+5k-15
We add all the numbers together, and all the variables
12k-15
Back to the equation:
-(12k-15)
-12k+15-87=0
We add all the numbers together, and all the variables
-12k-72=0
We move all terms containing k to the left, all other terms to the right
-12k=72
k=72/-12
k=-6
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