3y+9-8y=-21

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Solution for 3y+9-8y=-21 equation:


Simplifying
3y + 9 + -8y = -21

Reorder the terms:
9 + 3y + -8y = -21

Combine like terms: 3y + -8y = -5y
9 + -5y = -21

Solving
9 + -5y = -21

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + -5y = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -5y = -21 + -9
-5y = -21 + -9

Combine like terms: -21 + -9 = -30
-5y = -30

Divide each side by '-5'.
y = 6

Simplifying
y = 6

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