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0.8x+0.1x=3.6
We move all terms to the left:
0.8x+0.1x-(3.6)=0
We add all the numbers together, and all the variables
0.9x-3.6=0
We move all terms containing x to the left, all other terms to the right
0.9x=3.6
x=3.6/0.9
x=4
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