Answer :

If I get properly what you mean, it's about exchanging the letters (variables) with the numbers they are representing.

T = 5
H = 9

P = 6T + 4H
P = 6 * 5 + 4 * 9
P = 30 + 36
P = 66
P=6*5+4*9
P=30+36
P=66

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