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(124-x)*5+10x=840
We move all terms to the left:
(124-x)*5+10x-(840)=0
We add all the numbers together, and all the variables
(-1x+124)*5+10x-840=0
We add all the numbers together, and all the variables
10x+(-1x+124)*5-840=0
We multiply parentheses
10x-5x+620-840=0
We add all the numbers together, and all the variables
5x-220=0
We move all terms containing x to the left, all other terms to the right
5x=220
x=220/5
x=44
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