1) x+3 - 5x + 7 + 4y

x = 2.5 + y

Step-by-step explanation:

Simplifying

x + 3 + - 5x + 7 + 4y = 0

Reorder the terms:

3 + 7 + x + - 5x + 4y = 0

Combine like terms: 3 + 7 = 10

10 + x + - 5x + 4y = 0

Combine like terms: x + - 5x = - 4x

10 + - 4x + 4y = 0

Solving

10 + - 4x + 4y = 0

Solving for variable 'x'.

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

Add '-10' to each side of the equation.

10 + - 4x + - 10 + 4y = 0 + - 10

Reorder the terms:

10 + - 10 + - 4x + 4y = 0 + - 10

Combine like terms: 10 + - 10 = 0

0 + - 4x + 4y = 0 + - 10

-4x + 4y = 0 + - 10

Combine like terms: 0 + - 10 = - 10

-4x + 4y = - 10

Add '-4y' to each side of the equation.

-4x + 4y + - 4y = - 10 + - 4y

Combine like terms: 4y + - 4y = 0

-4x + 0 = - 10 + - 4y

-4x = - 10 + - 4y

Divide each side by '-4'.

x = 2.5 + y