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