4*10-y-y=20

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Solution for 4*10-y-y=20 equation:


4*10-y-y=20

We simplify the equation to the form, which is simple to understand 
4*10-y-y=20

We move all terms containing y to the left and all other terms to the right. 
-1y-1y=+20-40

We simplify left and right side of the equation. 
-2y=-20

We divide both sides of the equation by -2 to get y. 
y=10

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