What's the answer to

5+3x=7 (x+3)

-4

Step-by-step explanation:

Simplifying

5 + 3x = 7 (x + 3)

Reorder the terms:

5 + 3x = 7 (3 + x)

5 + 3x = (3 * 7 + x * 7)

5 + 3x = (21 + 7x)

Solving

5 + 3x = 21 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.

5 + 3x + - 7x = 21 + 7x + - 7x

Combine like terms: 3x + - 7x = - 4x

5 + - 4x = 21 + 7x + - 7x

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

5 + - 4x = 21 + 0

5 + - 4x = 21

Add '-5' to each side of the equation.

5 + - 5 + - 4x = 21 + - 5

Combine like terms: 5 + - 5 = 0

0 + - 4x = 21 + - 5

-4x = 21 + - 5

Combine like terms: 21 + - 5 = 16

-4x = 16

Divide each side by '-4'.

x = - 4

Simplifying

x = - 4