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0.15x+3.5x=6.5
We move all terms to the left:
0.15x+3.5x-(6.5)=0
We add all the numbers together, and all the variables
3.65x-6.5=0
We move all terms containing x to the left, all other terms to the right
3.65x=6.5
x=6.5/3.65
x=1+2.85/3.65
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