4y-1=9y-21

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Solution for 4y-1=9y-21 equation:


Simplifying
4y + -1 = 9y + -21

Reorder the terms:
-1 + 4y = 9y + -21

Reorder the terms:
-1 + 4y = -21 + 9y

Solving
-1 + 4y = -21 + 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
-1 + 4y + -9y = -21 + 9y + -9y

Combine like terms: 4y + -9y = -5y
-1 + -5y = -21 + 9y + -9y

Combine like terms: 9y + -9y = 0
-1 + -5y = -21 + 0
-1 + -5y = -21

Add '1' to each side of the equation.
-1 + 1 + -5y = -21 + 1

Combine like terms: -1 + 1 = 0
0 + -5y = -21 + 1
-5y = -21 + 1

Combine like terms: -21 + 1 = -20
-5y = -20

Divide each side by '-5'.
y = 4

Simplifying
y = 4

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