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-4×(-5+(-7)) = (-4×(-5)) + (p×(-7))
20+28 = 20 -7p
7p + 48 = 20
7p = -48 + 20
7p = -28
p = -28/7
p = -4

-4 x ( -5 + ( -7 ) ) = ( -4 x ( -5 ) ) + ( p x ( - 7 ) )
20 + 28 = 20 -7p
48 = 20 -7p
48 - 20 = -7p
28 = -7p
p = -4