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x-0.15x=630
We move all terms to the left:
x-0.15x-(630)=0
We add all the numbers together, and all the variables
0.85x-630=0
We move all terms containing x to the left, all other terms to the right
0.85x=630
x=630/0.85
x=741+0.14999999999998/0.85
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