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X+2X+3X+4X+5=74
We move all terms to the left:
X+2X+3X+4X+5-(74)=0
We add all the numbers together, and all the variables
10X-69=0
We move all terms containing X to the left, all other terms to the right
10X=69
X=69/10
X=6+9/10
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