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X+.3X=210
We move all terms to the left:
X+.3X-(210)=0
We add all the numbers together, and all the variables
1.3X-210=0
We move all terms containing X to the left, all other terms to the right
1.3X=210
X=210/1.3
X=161+0.69999999999999/1.3
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