3(X+1)+5(X-1)=18

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Solution for 3(X+1)+5(X-1)=18 equation:


Simplifying
3(X + 1) + 5(X + -1) = 18

Reorder the terms:
3(1 + X) + 5(X + -1) = 18
(1 * 3 + X * 3) + 5(X + -1) = 18
(3 + 3X) + 5(X + -1) = 18

Reorder the terms:
3 + 3X + 5(-1 + X) = 18
3 + 3X + (-1 * 5 + X * 5) = 18
3 + 3X + (-5 + 5X) = 18

Reorder the terms:
3 + -5 + 3X + 5X = 18

Combine like terms: 3 + -5 = -2
-2 + 3X + 5X = 18

Combine like terms: 3X + 5X = 8X
-2 + 8X = 18

Solving
-2 + 8X = 18

Solving for variable 'X'.

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

Add '2' to each side of the equation.
-2 + 2 + 8X = 18 + 2

Combine like terms: -2 + 2 = 0
0 + 8X = 18 + 2
8X = 18 + 2

Combine like terms: 18 + 2 = 20
8X = 20

Divide each side by '8'.
X = 2.5

Simplifying
X = 2.5

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