7X+3Y+2Z=21

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Solution for 7X+3Y+2Z=21 equation: 


Simplifying
7X + 3Y + 2Z = 21

Solving
7X + 3Y + 2Z = 21

Solving for variable 'X'.

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

Add '-3Y' to each side of the equation.
7X + 3Y + -3Y + 2Z = 21 + -3Y

Combine like terms: 3Y + -3Y = 0
7X + 0 + 2Z = 21 + -3Y
7X + 2Z = 21 + -3Y

Add '-2Z' to each side of the equation.
7X + 2Z + -2Z = 21 + -3Y + -2Z

Combine like terms: 2Z + -2Z = 0
7X + 0 = 21 + -3Y + -2Z
7X = 21 + -3Y + -2Z

Divide each side by '7'.
X = 3 + -0.4285714286Y + -0.2857142857Z

Simplifying
X = 3 + -0.4285714286Y + -0.2857142857Z

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