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3x+9x-3=50
We simplify the equation to the form, which is simple to understand
3x+9x-3=50
We move all terms containing x to the left and all other terms to the right.
+3x+9x=+50+3
We simplify left and right side of the equation.
+12x=+53
We divide both sides of the equation by 12 to get x.
x=4.4166666666667
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