3y-y=21-4

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Solution for 3y-y=21-4 equation: 


Simplifying
3y + -1y = 21 + -4

Combine like terms: 3y + -1y = 2y
2y = 21 + -4

Combine like terms: 21 + -4 = 17
2y = 17

Solving
2y = 17

Solving for variable 'y'.

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

Divide each side by '2'.
y = 8.5

Simplifying
y = 8.5

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