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21x+14=14x+63
We simplify the equation to the form, which is simple to understand
21x+14=14x+63
We move all terms containing x to the left and all other terms to the right.
+21x-14x=+63-14
We simplify left and right side of the equation.
+7x=+49
We divide both sides of the equation by 7 to get x.
x=7
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