84=3(x+7)+6x

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Solution for 84=3(x+7)+6x equation:


Simplifying
84 = 3(x + 7) + 6x

Reorder the terms:
84 = 3(7 + x) + 6x
84 = (7 * 3 + x * 3) + 6x
84 = (21 + 3x) + 6x

Combine like terms: 3x + 6x = 9x
84 = 21 + 9x

Solving
84 = 21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
84 + -9x = 21 + 9x + -9x

Combine like terms: 9x + -9x = 0
84 + -9x = 21 + 0
84 + -9x = 21

Add '-84' to each side of the equation.
84 + -84 + -9x = 21 + -84

Combine like terms: 84 + -84 = 0
0 + -9x = 21 + -84
-9x = 21 + -84

Combine like terms: 21 + -84 = -63
-9x = -63

Divide each side by '-9'.
x = 7

Simplifying
x = 7

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