21y-(y-1)=4

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Solution for 21y-(y-1)=4 equation:


Simplifying
21y + -1(y + -1) = 4

Reorder the terms:
21y + -1(-1 + y) = 4
21y + (-1 * -1 + y * -1) = 4
21y + (1 + -1y) = 4

Reorder the terms:
1 + 21y + -1y = 4

Combine like terms: 21y + -1y = 20y
1 + 20y = 4

Solving
1 + 20y = 4

Solving for variable 'y'.

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

Add '-1' to each side of the equation.
1 + -1 + 20y = 4 + -1

Combine like terms: 1 + -1 = 0
0 + 20y = 4 + -1
20y = 4 + -1

Combine like terms: 4 + -1 = 3
20y = 3

Divide each side by '20'.
y = 0.15

Simplifying
y = 0.15

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