3(30)-7y=21

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Solution for 3(30)-7y=21 equation: 


Simplifying
3(30) + -7y = 21

Multiply 3 * 30
90 + -7y = 21

Solving
90 + -7y = 21

Solving for variable 'y'.

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

Add '-90' to each side of the equation.
90 + -90 + -7y = 21 + -90

Combine like terms: 90 + -90 = 0
0 + -7y = 21 + -90
-7y = 21 + -90

Combine like terms: 21 + -90 = -69
-7y = -69

Divide each side by '-7'.
y = 9.857142857

Simplifying
y = 9.857142857

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