21+3y-5=15y-12-5y

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Solution for 21+3y-5=15y-12-5y equation: 


Simplifying
21 + 3y + -5 = 15y + -12 + -5y

Reorder the terms:
21 + -5 + 3y = 15y + -12 + -5y

Combine like terms: 21 + -5 = 16
16 + 3y = 15y + -12 + -5y

Reorder the terms:
16 + 3y = -12 + 15y + -5y

Combine like terms: 15y + -5y = 10y
16 + 3y = -12 + 10y

Solving
16 + 3y = -12 + 10y

Solving for variable 'y'.

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

Add '-10y' to each side of the equation.
16 + 3y + -10y = -12 + 10y + -10y

Combine like terms: 3y + -10y = -7y
16 + -7y = -12 + 10y + -10y

Combine like terms: 10y + -10y = 0
16 + -7y = -12 + 0
16 + -7y = -12

Add '-16' to each side of the equation.
16 + -16 + -7y = -12 + -16

Combine like terms: 16 + -16 = 0
0 + -7y = -12 + -16
-7y = -12 + -16

Combine like terms: -12 + -16 = -28
-7y = -28

Divide each side by '-7'.
y = 4

Simplifying
y = 4

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