please here are your answers:

a 3*4*7- 5*7= 49, b) 7*5 - 4*2 +10 = 35 - 8 +10 = 37, c) f(3) = 3*3 - 19 = -10

d) x = 30 -13 = 17, e) x = 11+18 = 30, f) 3x = 12, so x = 4, g) 7x = 28, so x = 4

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