(I need help finding the remaining reasons for each statement in the column proof, I already know the first two)

Finish the two-column Proof:
If AB = 5x, BC = 2x –4, and AC = 52, then x = 8.

(two column proof)
AB= 5x, BC = 2x -4, AC = 52 (Given)
52 = 5x + 2x -4 (Substitute)
52 + 4 = 7x
7x = 56
x = 56/7
x = 8

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