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3+x+x+3+2x-4=0
We simplify the equation to the form, which is simple to understand
3+x+x+3+2x-4=0
We move all terms containing x to the left and all other terms to the right.
+1x+1x+2x=0-3-3+4
We simplify left and right side of the equation.
+4x=-2
We divide both sides of the equation by 4 to get x.
x=-0.5
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