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(8.50+2.10+x)13=143.65
We move all terms to the left:
(8.50+2.10+x)13-(143.65)=0
We add all the numbers together, and all the variables
(x+10.6)13-(143.65)=0
We add all the numbers together, and all the variables
(x+10.6)13-143.65=0
We multiply parentheses
13x+137.8-143.65=0
We add all the numbers together, and all the variables
13x-5.85=0
We move all terms containing x to the left, all other terms to the right
13x=5.85
x=5.85/13
x=3.16216216216/7.02702702703
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