a + 125 × 74 = 340 × 45
a + 9 250 = 15 300
a = 15 300 - 9 250
a = 6 050
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64 × 360 - b = 120 × 30
23 040 - b = 3 600
b = 23 040 - 3 600
b = 19 440
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c - 480 × 50 = 317 × 60
c - 24 000 = 19 020
c = 19 020 + 24 000
c = 43 020
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87 × 610 - d = 50 × 240
53 070 - d = 12 000
d = 53 070 - 12 000
d = 41 070
