-1+y+9=-21+3y+15

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Solution for -1+y+9=-21+3y+15 equation:


Simplifying
-1 + y + 9 = -21 + 3y + 15

Reorder the terms:
-1 + 9 + y = -21 + 3y + 15

Combine like terms: -1 + 9 = 8
8 + y = -21 + 3y + 15

Reorder the terms:
8 + y = -21 + 15 + 3y

Combine like terms: -21 + 15 = -6
8 + y = -6 + 3y

Solving
8 + y = -6 + 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.
8 + y + -3y = -6 + 3y + -3y

Combine like terms: y + -3y = -2y
8 + -2y = -6 + 3y + -3y

Combine like terms: 3y + -3y = 0
8 + -2y = -6 + 0
8 + -2y = -6

Add '-8' to each side of the equation.
8 + -8 + -2y = -6 + -8

Combine like terms: 8 + -8 = 0
0 + -2y = -6 + -8
-2y = -6 + -8

Combine like terms: -6 + -8 = -14
-2y = -14

Divide each side by '-2'.
y = 7

Simplifying
y = 7

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