10y+90=3y+21

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Solution for 10y+90=3y+21 equation:


Simplifying
10y + 90 = 3y + 21

Reorder the terms:
90 + 10y = 3y + 21

Reorder the terms:
90 + 10y = 21 + 3y

Solving
90 + 10y = 21 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
90 + 10y + -3y = 21 + 3y + -3y

Combine like terms: 10y + -3y = 7y
90 + 7y = 21 + 3y + -3y

Combine like terms: 3y + -3y = 0
90 + 7y = 21 + 0
90 + 7y = 21

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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