7x-18=7x-y

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Solution for 7x-18=7x-y equation:


Simplifying
7x + -18 = 7x + -1y

Reorder the terms:
-18 + 7x = 7x + -1y

Add '-7x' to each side of the equation.
-18 + 7x + -7x = 7x + -7x + -1y

Combine like terms: 7x + -7x = 0
-18 + 0 = 7x + -7x + -1y
-18 = 7x + -7x + -1y

Combine like terms: 7x + -7x = 0
-18 = 0 + -1y
-18 = -1y

Solving
-18 = -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
-18 + y = -1y + y

Combine like terms: -1y + y = 0
-18 + y = 0

Add '18' to each side of the equation.
-18 + 18 + y = 0 + 18

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

Combine like terms: 0 + 18 = 18
y = 18

Simplifying
y = 18

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