3(x+4)+5(x-3)=21

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Solution for 3(x+4)+5(x-3)=21 equation:


Simplifying
3(x + 4) + 5(x + -3) = 21

Reorder the terms:
3(4 + x) + 5(x + -3) = 21
(4 * 3 + x * 3) + 5(x + -3) = 21
(12 + 3x) + 5(x + -3) = 21

Reorder the terms:
12 + 3x + 5(-3 + x) = 21
12 + 3x + (-3 * 5 + x * 5) = 21
12 + 3x + (-15 + 5x) = 21

Reorder the terms:
12 + -15 + 3x + 5x = 21

Combine like terms: 12 + -15 = -3
-3 + 3x + 5x = 21

Combine like terms: 3x + 5x = 8x
-3 + 8x = 21

Solving
-3 + 8x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 8x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 8x = 21 + 3
8x = 21 + 3

Combine like terms: 21 + 3 = 24
8x = 24

Divide each side by '8'.
x = 3

Simplifying
x = 3

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