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4x+8x-1=20
We simplify the equation to the form, which is simple to understand
4x+8x-1=20
We move all terms containing x to the left and all other terms to the right.
+4x+8x=+20+1
We simplify left and right side of the equation.
+12x=+21
We divide both sides of the equation by 12 to get x.
x=1.75
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