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-121+21x=14x+215
We simplify the equation to the form, which is simple to understand
-121+21x=14x+215
We move all terms containing x to the left and all other terms to the right.
+21x-14x=+215+121
We simplify left and right side of the equation.
+7x=+336
We divide both sides of the equation by 7 to get x.
x=48
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