3x+3(2x-21)=18

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Solution for 3x+3(2x-21)=18 equation:


Simplifying
3x + 3(2x + -21) = 18

Reorder the terms:
3x + 3(-21 + 2x) = 18
3x + (-21 * 3 + 2x * 3) = 18
3x + (-63 + 6x) = 18

Reorder the terms:
-63 + 3x + 6x = 18

Combine like terms: 3x + 6x = 9x
-63 + 9x = 18

Solving
-63 + 9x = 18

Solving for variable 'x'.

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

Add '63' to each side of the equation.
-63 + 63 + 9x = 18 + 63

Combine like terms: -63 + 63 = 0
0 + 9x = 18 + 63
9x = 18 + 63

Combine like terms: 18 + 63 = 81
9x = 81

Divide each side by '9'.
x = 9

Simplifying
x = 9

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