Subtract:
$(a) 3 p from 7 p$
$(b) - 8 x from 9 x$
$(c) - 3 a from 7 a$
$(d) - 9 b from - 2 b$

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Solution

$(a) 7 p - 3 p = (7 - 3) p = 4 p$
$(b) 9 x - (- 8 x) = 9 x + 8 x = (9 + 8) x = 17 x$
$(c) 7 a - (- 3 a) = 7 a + 3 a = (7 + 3) a = 10 a$
$(d) - 2 b - (- 9 b) = - 2 b + 9 b = (- 2 + 9) b = 7 b$

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