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3x+4(-x)+5=0
We simplify the equation to the form, which is simple to understand
3x+4(-x)+5=0
Reorder the terms in parentheses
3x+(-4x)+5=0
Remove unnecessary parentheses
+3x-4x+5=0
We move all terms containing x to the left and all other terms to the right.
+3x-4x=0-5
We simplify left and right side of the equation.
-1x=-5
We divide both sides of the equation by -1 to get x.
x=5
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