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0.6n-7.8(-4.2n-0.2)=135
We move all terms to the left:
0.6n-7.8(-4.2n-0.2)-(135)=0
We multiply parentheses
0.6n+31.2n+1.56-135=0
We add all the numbers together, and all the variables
31.8n-133.44=0
We move all terms containing n to the left, all other terms to the right
31.8n=133.44
n=133.44/31.8
n=4+5.03225806452/25.6451612903
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