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5x-1=7x-21
We simplify the equation to the form, which is simple to understand
5x-1=7x-21
We move all terms containing x to the left and all other terms to the right.
+5x-7x=-21+1
We simplify left and right side of the equation.
-2x=-20
We divide both sides of the equation by -2 to get x.
x=10
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