x+2x+(x-3)=45

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Solution for x+2x+(x-3)=45 equation:


Simplifying
x + 2x + (x + -3) = 45

Reorder the terms:
x + 2x + (-3 + x) = 45

Remove parenthesis around (-3 + x)
x + 2x + -3 + x = 45

Reorder the terms:
-3 + x + 2x + x = 45

Combine like terms: x + 2x = 3x
-3 + 3x + x = 45

Combine like terms: 3x + x = 4x
-3 + 4x = 45

Solving
-3 + 4x = 45

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 4x = 45 + 3

Combine like terms: -3 + 3 = 0
0 + 4x = 45 + 3
4x = 45 + 3

Combine like terms: 45 + 3 = 48
4x = 48

Divide each side by '4'.
x = 12

Simplifying
x = 12

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