5x+4[2x-9]=81

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Solution for 5x+4[2x-9]=81 equation:


Simplifying
5x + 4[2x + -9] = 81

Reorder the terms:
5x + 4[-9 + 2x] = 81
5x + [-9 * 4 + 2x * 4] = 81
5x + [-36 + 8x] = 81

Reorder the terms:
-36 + 5x + 8x = 81

Combine like terms: 5x + 8x = 13x
-36 + 13x = 81

Solving
-36 + 13x = 81

Solving for variable 'x'.

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

Add '36' to each side of the equation.
-36 + 36 + 13x = 81 + 36

Combine like terms: -36 + 36 = 0
0 + 13x = 81 + 36
13x = 81 + 36

Combine like terms: 81 + 36 = 117
13x = 117

Divide each side by '13'.
x = 9

Simplifying
x = 9

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