x+2x+7=3x-y

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Solution for x+2x+7=3x-y equation:


Simplifying
x + 2x + 7 = 3x + -1y

Reorder the terms:
7 + x + 2x = 3x + -1y

Combine like terms: x + 2x = 3x
7 + 3x = 3x + -1y

Add '-3x' to each side of the equation.
7 + 3x + -3x = 3x + -3x + -1y

Combine like terms: 3x + -3x = 0
7 + 0 = 3x + -3x + -1y
7 = 3x + -3x + -1y

Combine like terms: 3x + -3x = 0
7 = 0 + -1y
7 = -1y

Solving
7 = -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.
7 + y = -1y + y

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

Add '-7' to each side of the equation.
7 + -7 + y = 0 + -7

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

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

Simplifying
y = -7

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