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3x+6x-4=15
We simplify the equation to the form, which is simple to understand
3x+6x-4=15
We move all terms containing x to the left and all other terms to the right.
+3x+6x=+15+4
We simplify left and right side of the equation.
+9x=+19
We divide both sides of the equation by 9 to get x.
x=2.1111111111111
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