Which expression can you substitute in the indicated equation to solve.

3x - y = 5

x+2y = 4

A : 2y - 4 for x in 3x - y = 5

B: 4 - x for y in 3x - y = 5

C: 3x - 5 for y in 3x - y = 5

D: 3x - 5 for y in x+2y = 4

What is the value of x if 5ax+2a equals 9a?

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How to write an algebraic equation?