15y+18-2y=-21

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Solution for 15y+18-2y=-21 equation:


Simplifying
15y + 18 + -2y = -21

Reorder the terms:
18 + 15y + -2y = -21

Combine like terms: 15y + -2y = 13y
18 + 13y = -21

Solving
18 + 13y = -21

Solving for variable 'y'.

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

Add '-18' to each side of the equation.
18 + -18 + 13y = -21 + -18

Combine like terms: 18 + -18 = 0
0 + 13y = -21 + -18
13y = -21 + -18

Combine like terms: -21 + -18 = -39
13y = -39

Divide each side by '13'.
y = -3

Simplifying
y = -3

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