3(7-x)+5(x-4)=9

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Solution for 3(7-x)+5(x-4)=9 equation:


Simplifying
3(7 + -1x) + 5(x + -4) = 9
(7 * 3 + -1x * 3) + 5(x + -4) = 9
(21 + -3x) + 5(x + -4) = 9

Reorder the terms:
21 + -3x + 5(-4 + x) = 9
21 + -3x + (-4 * 5 + x * 5) = 9
21 + -3x + (-20 + 5x) = 9

Reorder the terms:
21 + -20 + -3x + 5x = 9

Combine like terms: 21 + -20 = 1
1 + -3x + 5x = 9

Combine like terms: -3x + 5x = 2x
1 + 2x = 9

Solving
1 + 2x = 9

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 2x = 9 + -1

Combine like terms: 1 + -1 = 0
0 + 2x = 9 + -1
2x = 9 + -1

Combine like terms: 9 + -1 = 8
2x = 8

Divide each side by '2'.
x = 4

Simplifying
x = 4

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