4*20=100-y

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Solution for 4*20=100-y equation:


Simplifying
4 * 20 = 100 + -1y

Multiply 4 * 20
80 = 100 + -1y

Solving
80 = 100 + -1y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add 'y' to each side of the equation.
80 + y = 100 + -1y + y

Combine like terms: -1y + y = 0
80 + y = 100 + 0
80 + y = 100

Add '-80' to each side of the equation.
80 + -80 + y = 100 + -80

Combine like terms: 80 + -80 = 0
0 + y = 100 + -80
y = 100 + -80

Combine like terms: 100 + -80 = 20
y = 20

Simplifying
y = 20

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