(9x+4)-(2x-21)=39

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Solution for (9x+4)-(2x-21)=39 equation:


Simplifying
(9x + 4) + -1(2x + -21) = 39

Reorder the terms:
(4 + 9x) + -1(2x + -21) = 39

Remove parenthesis around (4 + 9x)
4 + 9x + -1(2x + -21) = 39

Reorder the terms:
4 + 9x + -1(-21 + 2x) = 39
4 + 9x + (-21 * -1 + 2x * -1) = 39
4 + 9x + (21 + -2x) = 39

Reorder the terms:
4 + 21 + 9x + -2x = 39

Combine like terms: 4 + 21 = 25
25 + 9x + -2x = 39

Combine like terms: 9x + -2x = 7x
25 + 7x = 39

Solving
25 + 7x = 39

Solving for variable 'x'.

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

Add '-25' to each side of the equation.
25 + -25 + 7x = 39 + -25

Combine like terms: 25 + -25 = 0
0 + 7x = 39 + -25
7x = 39 + -25

Combine like terms: 39 + -25 = 14
7x = 14

Divide each side by '7'.
x = 2

Simplifying
x = 2

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