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0.3x + 0.4(30-x)=10.3
We simplify the equation to the form, which is simple to understand
0.3x + 0.4(30-x)=10.3
Reorder the terms in parentheses
0.3x+(+12-0.4x)=10.3
Remove unnecessary parentheses
+ 0.3x+12-0.4x=+10.3
We move all terms containing x to the left and all other terms to the right.
+ 0.3x-0.4x=+10.3-12
We simplify left and right side of the equation.
-0.1x=-1.7
We divide both sides of the equation by -0.1 to get x.
x=17
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