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9x-78=90-3x
We simplify the equation to the form, which is simple to understand
9x-78=90-3x
We move all terms containing x to the left and all other terms to the right.
+9x+3x=+90+78
We simplify left and right side of the equation.
+12x=+168
We divide both sides of the equation by 12 to get x.
x=14
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