Respuesta :

ricchad

Answer:

x = -11

Step-by-step explanation:

80 + x + 51 + 60 = 180

x = 180 - 80 - 51 - 60

x = -11

substitute x=-11 back into the eq.

80 + x + 51 + 60 = 180

80 - 11 + 51 + 60 = 180

180 = 180  OK

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