-255=3x-7(3x+21)

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Solution for -255=3x-7(3x+21) equation:


Simplifying
-255 = 3x + -7(3x + 21)

Reorder the terms:
-255 = 3x + -7(21 + 3x)
-255 = 3x + (21 * -7 + 3x * -7)
-255 = 3x + (-147 + -21x)

Reorder the terms:
-255 = -147 + 3x + -21x

Combine like terms: 3x + -21x = -18x
-255 = -147 + -18x

Solving
-255 = -147 + -18x

Solving for variable 'x'.

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

Add '18x' to each side of the equation.
-255 + 18x = -147 + -18x + 18x

Combine like terms: -18x + 18x = 0
-255 + 18x = -147 + 0
-255 + 18x = -147

Add '255' to each side of the equation.
-255 + 255 + 18x = -147 + 255

Combine like terms: -255 + 255 = 0
0 + 18x = -147 + 255
18x = -147 + 255

Combine like terms: -147 + 255 = 108
18x = 108

Divide each side by '18'.
x = 6

Simplifying
x = 6

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