3(7-y)-y=5

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Solution for 3(7-y)-y=5 equation: 


Simplifying
3(7 + -1y) + -1y = 5
(7 * 3 + -1y * 3) + -1y = 5
(21 + -3y) + -1y = 5

Combine like terms: -3y + -1y = -4y
21 + -4y = 5

Solving
21 + -4y = 5

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + -4y = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -4y = 5 + -21
-4y = 5 + -21

Combine like terms: 5 + -21 = -16
-4y = -16

Divide each side by '-4'.
y = 4

Simplifying
y = 4

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