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0.5x+1.4=0.9x-2.2
We move all terms to the left:
0.5x+1.4-(0.9x-2.2)=0
We get rid of parentheses
0.5x-0.9x+2.2+1.4=0
We add all the numbers together, and all the variables
-0.4x+3.6=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-3.6
x=-3.6/-0.4
x=+9
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