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15+6.3-4=-3x
We move all terms to the left:
15+6.3-4-(-3x)=0
We add all the numbers together, and all the variables
-(-3x)+17.3=0
We get rid of parentheses
3x+17.3=0
We move all terms containing x to the left, all other terms to the right
3x=-17.3
x=-17.3/3
x=-5+2.3/3
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