x+3x-5=12+3

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Solution for x+3x-5=12+3 equation:


Simplifying
x + 3x + -5 = 12 + 3

Reorder the terms:
-5 + x + 3x = 12 + 3

Combine like terms: x + 3x = 4x
-5 + 4x = 12 + 3

Combine like terms: 12 + 3 = 15
-5 + 4x = 15

Solving
-5 + 4x = 15

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + 4x = 15 + 5

Combine like terms: -5 + 5 = 0
0 + 4x = 15 + 5
4x = 15 + 5

Combine like terms: 15 + 5 = 20
4x = 20

Divide each side by '4'.
x = 5

Simplifying
x = 5

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