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x+21=4x-45
We simplify the equation to the form, which is simple to understand
x+21=4x-45
We move all terms containing x to the left and all other terms to the right.
+1x-4x=-45-21
We simplify left and right side of the equation.
-3x=-66
We divide both sides of the equation by -3 to get x.
x=22
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