8-7y=90-21y

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Solution for 8-7y=90-21y equation:


Simplifying
8 + -7y = 90 + -21y

Solving
8 + -7y = 90 + -21y

Solving for variable 'y'.

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

Add '21y' to each side of the equation.
8 + -7y + 21y = 90 + -21y + 21y

Combine like terms: -7y + 21y = 14y
8 + 14y = 90 + -21y + 21y

Combine like terms: -21y + 21y = 0
8 + 14y = 90 + 0
8 + 14y = 90

Add '-8' to each side of the equation.
8 + -8 + 14y = 90 + -8

Combine like terms: 8 + -8 = 0
0 + 14y = 90 + -8
14y = 90 + -8

Combine like terms: 90 + -8 = 82
14y = 82

Divide each side by '14'.
y = 5.857142857

Simplifying
y = 5.857142857

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