x+4+x=18+3

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Solution for x+4+x=18+3 equation:


Simplifying
x + 4 + x = 18 + 3

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

Combine like terms: x + x = 2x
4 + 2x = 18 + 3

Combine like terms: 18 + 3 = 21
4 + 2x = 21

Solving
4 + 2x = 21

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + 2x = 21 + -4

Combine like terms: 4 + -4 = 0
0 + 2x = 21 + -4
2x = 21 + -4

Combine like terms: 21 + -4 = 17
2x = 17

Divide each side by '2'.
x = 8.5

Simplifying
x = 8.5

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