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(18-3).7-4.(15-5)+13-9
15.7-4.10+13-9
105-40+4
65+4
69=respuesta
(108:6 - 3)*7 - 4(3*5 - 5) + 156:12 - 9
= (18 - 3)*7 - 4(15 - 5) + 13 - 9
= 15*7 - 4*10 + 13 - 9
= 105 - 40 + 13 - 9
= 118 - 49
= 69