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1.8x+0.6=4.2
We move all terms to the left:
1.8x+0.6-(4.2)=0
We add all the numbers together, and all the variables
1.8x-3.6=0
We move all terms containing x to the left, all other terms to the right
1.8x=3.6
x=3.6/1.8
x=2
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