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9x-x+1+9=12
We simplify the equation to the form, which is simple to understand
9x-x+1+9=12
We move all terms containing x to the left and all other terms to the right.
+9x-1x=+12-1-9
We simplify left and right side of the equation.
+8x=+2
We divide both sides of the equation by 8 to get x.
x=0.25
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