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5x+2x-4x+7+3=31
We simplify the equation to the form, which is simple to understand
5x+2x-4x+7+3=31
We move all terms containing x to the left and all other terms to the right.
+5x+2x-4x=+31-7-3
We simplify left and right side of the equation.
+3x=+21
We divide both sides of the equation by 3 to get x.
x=7
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