-123=-3(6+7x)

Solution for -123=-3(6+7x) equation:

Simplifying
-123 = -3(6 + 7x)
-123 = (6 * -3 + 7x * -3)
-123 = (-18 + -21x)

Solving
-123 = -18 + -21x

Solving for variable 'x'.

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

Add '21x' to each side of the equation.
-123 + 21x = -18 + -21x + 21x

Combine like terms: -21x + 21x = 0
-123 + 21x = -18 + 0
-123 + 21x = -18

Add '123' to each side of the equation.
-123 + 123 + 21x = -18 + 123

Combine like terms: -123 + 123 = 0
0 + 21x = -18 + 123
21x = -18 + 123

Combine like terms: -18 + 123 = 105
21x = 105

Divide each side by '21'.
x = 5

Simplifying
x = 5