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x+0.21x-0.15x=150
We move all terms to the left:
x+0.21x-0.15x-(150)=0
We add all the numbers together, and all the variables
1.06x-150=0
We move all terms containing x to the left, all other terms to the right
1.06x=150
x=150/1.06
x=141+0.53999999999999/1.06
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