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x+2x+3x+4x+5x=50
We move all terms to the left:
x+2x+3x+4x+5x-(50)=0
We add all the numbers together, and all the variables
15x-50=0
We move all terms containing x to the left, all other terms to the right
15x=50
x=50/15
x=3+1/3
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