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4+x-4(1-x)+5(2+x)=0
We simplify the equation to the form, which is simple to understand
4+x-4(1-x)+5(2+x)=0
Reorder the terms in parentheses
4+x+(-4+4x)+5*(2+x)=0
Remove unnecessary parentheses
+4+x-4+4x+5+*(+2+x+)=0
Reorder the terms in parentheses
4+x-4+4x+(+10+5x)=0
Remove unnecessary parentheses
+4+x-4+4x+10+5x=0
We move all terms containing x to the left and all other terms to the right.
+1x+4x+5x=0-4+4-10
We simplify left and right side of the equation.
+10x=-10
We divide both sides of the equation by 10 to get x.
x=-1
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