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-4.2x+3.4=-11.72
We move all terms to the left:
-4.2x+3.4-(-11.72)=0
We add all the numbers together, and all the variables
-4.2x+15.12=0
We move all terms containing x to the left, all other terms to the right
-4.2x=-15.12
x=-15.12/-4.2
x=3+1/1.6666666666667
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