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1x-0.30x=15
We move all terms to the left:
1x-0.30x-(15)=0
We add all the numbers together, and all the variables
0.7x-15=0
We move all terms containing x to the left, all other terms to the right
0.7x=15
x=15/0.7
x=21+0.3/0.7
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