y+4x=9+3

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Solution for y+4x=9+3 equation: 


Simplifying
y + 4x = 9 + 3

Reorder the terms:
4x + y = 9 + 3

Combine like terms: 9 + 3 = 12
4x + y = 12

Solving
4x + y = 12

Solving for variable 'x'.

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

Add '-1y' to each side of the equation.
4x + y + -1y = 12 + -1y

Combine like terms: y + -1y = 0
4x + 0 = 12 + -1y
4x = 12 + -1y

Divide each side by '4'.
x = 3 + -0.25y

Simplifying
x = 3 + -0.25y

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