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15.4 = 1.4p

Divide both sides by 1.4, so as to not alter the equation:

15.4 / 1.4 = 1.4p / 1.4

Realize that 1.4 / 1.4 = 1

15.4 / 1.4 = p

Use a calculator to find 15.4 / 1.4

11 = p

Divide 15.4 by 1.4 to get p

1.4p = 15.4

p = 11.