7 - (-19) - 18 + (-19) + 18
= 26 - 18 + (-19) + 18
= 8 + (-19) + 18
= - 11 + 18
= 7
Remember:
• follow BEDMAS or PEDMAS
• always go from left to right
• 2 negatives = positive
• 2 positives = negative
• negative and a positive = negative (and vice versa)