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x+3x+x+65=0
We simplify the equation to the form, which is simple to understand
x+3x+x+65=0
We move all terms containing x to the left and all other terms to the right.
+1x+3x+1x=0-65
We simplify left and right side of the equation.
+5x=-65
We divide both sides of the equation by 5 to get x.
x=-13
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