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(87+61+x)/3=80
We move all terms to the left:
(87+61+x)/3-(80)=0
We add all the numbers together, and all the variables
(x+148)/3-80=0
We multiply all the terms by the denominator
(x+148)-80*3=0
We add all the numbers together, and all the variables
(x+148)-240=0
We get rid of parentheses
x+148-240=0
We add all the numbers together, and all the variables
x-92=0
We move all terms containing x to the left, all other terms to the right
x=92
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