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`x+2+3x=0`

We simplify the equation to the form, which is simple to understand

x+2+3x=0

We move all terms containing x to the left and all other terms to the right.

+1x+3x=0-2

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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