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x+x*0.15=1500
We move all terms to the left:
x+x*0.15-(1500)=0
Wy multiply elements
x+0.15x-1500=0
We add all the numbers together, and all the variables
1.15x-1500=0
We move all terms containing x to the left, all other terms to the right
1.15x=1500
x=1500/1.15
x=1304+0.4/1.15
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