x+3(6+x)=20

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Solution for x+3(6+x)=20 equation: 


Simplifying
x + 3(6 + x) = 20
x + (6 * 3 + x * 3) = 20
x + (18 + 3x) = 20

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

Combine like terms: x + 3x = 4x
18 + 4x = 20

Solving
18 + 4x = 20

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 4x = 20 + -18

Combine like terms: 18 + -18 = 0
0 + 4x = 20 + -18
4x = 20 + -18

Combine like terms: 20 + -18 = 2
4x = 2

Divide each side by '4'.
x = 0.5

Simplifying
x = 0.5

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