2 years ago

Help me please I do not understand it.

Mathematics

1 answer:

fiasKO [112]2 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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