2*2-7y=21

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Solution for 2*2-7y=21 equation: 


Simplifying
2 * 2 + -7y = 21

Multiply 2 * 2
4 + -7y = 21

Solving
4 + -7y = 21

Solving for variable 'y'.

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

Add '-4' to each side of the equation.
4 + -4 + -7y = 21 + -4

Combine like terms: 4 + -4 = 0
0 + -7y = 21 + -4
-7y = 21 + -4

Combine like terms: 21 + -4 = 17
-7y = 17

Divide each side by '-7'.
y = -2.428571429

Simplifying
y = -2.428571429

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