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12-7x=78-21x
We simplify the equation to the form, which is simple to understand
12-7x=78-21x
We move all terms containing x to the left and all other terms to the right.
-7x+21x=+78-12
We simplify left and right side of the equation.
+14x=+66
We divide both sides of the equation by 14 to get x.
x=4.71428571429
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