3A-4B+7C=28

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Solution for 3A-4B+7C=28 equation: 


Simplifying
3A + -4B + 7C = 28

Solving
3A + -4B + 7C = 28

Solving for variable 'A'.

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

Add '4B' to each side of the equation.
3A + -4B + 4B + 7C = 28 + 4B

Combine like terms: -4B + 4B = 0
3A + 0 + 7C = 28 + 4B
3A + 7C = 28 + 4B

Add '-7C' to each side of the equation.
3A + 7C + -7C = 28 + 4B + -7C

Combine like terms: 7C + -7C = 0
3A + 0 = 28 + 4B + -7C
3A = 28 + 4B + -7C

Divide each side by '3'.
A = 9.333333333 + 1.333333333B + -2.333333333C

Simplifying
A = 9.333333333 + 1.333333333B + -2.333333333C

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