18-3y+7-y=20+4y-15

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Solution for 18-3y+7-y=20+4y-15 equation: 


Simplifying
18 + -3y + 7 + -1y = 20 + 4y + -15

Reorder the terms:
18 + 7 + -3y + -1y = 20 + 4y + -15

Combine like terms: 18 + 7 = 25
25 + -3y + -1y = 20 + 4y + -15

Combine like terms: -3y + -1y = -4y
25 + -4y = 20 + 4y + -15

Reorder the terms:
25 + -4y = 20 + -15 + 4y

Combine like terms: 20 + -15 = 5
25 + -4y = 5 + 4y

Solving
25 + -4y = 5 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
25 + -4y + -4y = 5 + 4y + -4y

Combine like terms: -4y + -4y = -8y
25 + -8y = 5 + 4y + -4y

Combine like terms: 4y + -4y = 0
25 + -8y = 5 + 0
25 + -8y = 5

Add '-25' to each side of the equation.
25 + -25 + -8y = 5 + -25

Combine like terms: 25 + -25 = 0
0 + -8y = 5 + -25
-8y = 5 + -25

Combine like terms: 5 + -25 = -20
-8y = -20

Divide each side by '-8'.
y = 2.5

Simplifying
y = 2.5

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