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In math problems without punctuation such as brackets, the standard convention in to solve from left to right. Therefore, you would solve the problem 15-3 times 4 plus nine like by three actions. 15-3 equals 12; 12 times 4 equals 48; 48 plus 9 equals 57.
50 + 5 + 2
87
57 + z = 97 z = 97 - 57 z = 40
19 *3= 57