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130-(45x2)
130-90
40
2. (45:15)+30
3+30
33
2.(45:b)+30
b = 15
1. 130 - (3b × 2) = 130 - (3(15) × 2)
= 130 - (90)
= 40
2. (45:b)+30 = (45 : 15) + 30
= (3) + 30
= 33