x+x+(3x+20)=18

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Solution for x+x+(3x+20)=18 equation:


Simplifying
x + x + (3x + 20) = 18

Reorder the terms:
x + x + (20 + 3x) = 18

Remove parenthesis around (20 + 3x)
x + x + 20 + 3x = 18

Reorder the terms:
20 + x + x + 3x = 18

Combine like terms: x + x = 2x
20 + 2x + 3x = 18

Combine like terms: 2x + 3x = 5x
20 + 5x = 18

Solving
20 + 5x = 18

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + 5x = 18 + -20

Combine like terms: 20 + -20 = 0
0 + 5x = 18 + -20
5x = 18 + -20

Combine like terms: 18 + -20 = -2
5x = -2

Divide each side by '5'.
x = -0.4

Simplifying
x = -0.4

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