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7x+3x+20=0
We simplify the equation to the form, which is simple to understand
7x+3x+20=0
We move all terms containing x to the left and all other terms to the right.
+7x+3x=0-20
We simplify left and right side of the equation.
+10x=-20
We divide both sides of the equation by 10 to get x.
x=-2
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