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x+1+3+x+3+x+3+x+3=100
We move all terms to the left:
x+1+3+x+3+x+3+x+3-(100)=0
We add all the numbers together, and all the variables
4x-87=0
We move all terms containing x to the left, all other terms to the right
4x=87
x=87/4
x=21+3/4
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