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2x+28=x+21
We simplify the equation to the form, which is simple to understand
2x+28=x+21
We move all terms containing x to the left and all other terms to the right.
+2x-1x=+21-28
We simplify left and right side of the equation.
+1x=-7
We divide both sides of the equation by 1 to get x.
x=-7
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