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100=5x+4x+3x+2x+x
We move all terms to the left:
100-(5x+4x+3x+2x+x)=0
We add all the numbers together, and all the variables
-(+15x)+100=0
We get rid of parentheses
-15x+100=0
We move all terms containing x to the left, all other terms to the right
-15x=-100
x=-100/-15
x=6+2/3
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