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0.3x-0.9(20-5x)=-0.4(x-7)
We simplify the equation to the form, which is simple to understand
0.3x-0.9(20-5x)=-0.4(x-7)
Reorder the terms in parentheses
0.3x+(-18+4.5x)=-0.4*(x-7)
Remove unnecessary parentheses
+ 0.3x-18+4.5x=-0.4+*(+x-7+)
Reorder the terms in parentheses
0.3x-18+4.5x=+(-0.4x+2.8)
Remove unnecessary parentheses
+ 0.3x-18+4.5x=-0.4x+2.8
We move all terms containing x to the left and all other terms to the right.
+ 0.3x+4.5x + 0.4x=+2.8+18
We simplify left and right side of the equation.
+5.2x=+20.8
We divide both sides of the equation by 5.2 to get x.
x=4
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