18=3(5+x)+5(1+x)

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


Simplifying
18 = 3(5 + x) + 5(1 + x)
18 = (5 * 3 + x * 3) + 5(1 + x)
18 = (15 + 3x) + 5(1 + x)
18 = 15 + 3x + (1 * 5 + x * 5)
18 = 15 + 3x + (5 + 5x)

Reorder the terms:
18 = 15 + 5 + 3x + 5x

Combine like terms: 15 + 5 = 20
18 = 20 + 3x + 5x

Combine like terms: 3x + 5x = 8x
18 = 20 + 8x

Solving
18 = 20 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
18 + -8x = 20 + 8x + -8x

Combine like terms: 8x + -8x = 0
18 + -8x = 20 + 0
18 + -8x = 20

Add '-18' to each side of the equation.
18 + -18 + -8x = 20 + -18

Combine like terms: 18 + -18 = 0
0 + -8x = 20 + -18
-8x = 20 + -18

Combine like terms: 20 + -18 = 2
-8x = 2

Divide each side by '-8'.
x = -0.25

Simplifying
x = -0.25

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