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2x + 6x - 3x = 21
We simplify the equation to the form, which is simple to understand
2x+6x-3x=21
We move all terms containing x to the left and all other terms to the right.
+2x+6x-3x=+21
We simplify left and right side of the equation.
+5x=+21
We divide both sides of the equation by 5 to get x.
x=4.2
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