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-9x+2.2=-3x+7.0x=
We move all terms to the left:
-9x+2.2-(-3x+7.0x)=0
We add all the numbers together, and all the variables
-9x-(+4x)+2.2=0
We get rid of parentheses
-9x-4x+2.2=0
We add all the numbers together, and all the variables
-13x+2.2=0
We move all terms containing x to the left, all other terms to the right
-13x=-2.2
x=-2.2/-13
x=2.2/13
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