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4x+21=5x+15
We simplify the equation to the form, which is simple to understand
4x+21=5x+15
We move all terms containing x to the left and all other terms to the right.
+4x-5x=+15-21
We simplify left and right side of the equation.
-1x=-6
We divide both sides of the equation by -1 to get x.
x=6
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