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3(-7)+3(51/5)+k=0
We add all the numbers together, and all the variables
k+3(-7)+3(+51/5)=0
We add all the numbers together, and all the variables
k-21+3(+51/5)=0
We multiply parentheses
k-21+51/5*3=0
We multiply all the terms by the denominator
k*5*3+51-21*5*3=0
We add all the numbers together, and all the variables
k*5*3-264=0
Wy multiply elements
15k*3-264=0
Wy multiply elements
45k-264=0
We move all terms containing k to the left, all other terms to the right
45k=264
k=264/45
k=5+13/15
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