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10x=4x+21
We simplify the equation to the form, which is simple to understand
10x=4x+21
We move all terms containing x to the left and all other terms to the right.
+10x-4x=+21
We simplify left and right side of the equation.
+6x=+21
We divide both sides of the equation by 6 to get x.
x=3.5
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