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12x-4=21x+2
We simplify the equation to the form, which is simple to understand
12x-4=21x+2
We move all terms containing x to the left and all other terms to the right.
+12x-21x=+2+4
We simplify left and right side of the equation.
-9x=+6
We divide both sides of the equation by -9 to get x.
x=-0.666666666667
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