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pishuonlain [190]
3 years ago
10

Help me please I do not understand it.

Mathematics
1 answer:
fiasKO [112]3 years ago
4 0
6x - 11 + 15x + 2 = 180

21x - 9 = 180

21x = 189

x = 9

—

D = 15(9) + 2

D = 135 + 2

D = 137
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