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(x+3)+(2x-1)=0
We simplify the equation to the form, which is simple to understand
(x+3)+(2x-1)=0
Remove unnecessary parentheses
x+3+(2x-1)=0
Remove unnecessary parentheses
+x+3+2x-1=0
We move all terms containing x to the left and all other terms to the right.
+1x+2x=0-3+1
We simplify left and right side of the equation.
+3x=-2
We divide both sides of the equation by 3 to get x.
x=-0.666666666667
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