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100x=400-20x-1*100-80x
We move all terms to the left:
100x-(400-20x-1*100-80x)=0
We add all the numbers together, and all the variables
100x-(-100x+300)=0
We get rid of parentheses
100x+100x-300=0
We add all the numbers together, and all the variables
200x-300=0
We move all terms containing x to the left, all other terms to the right
200x=300
x=300/200
x=1+1/2
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