Question

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Answer 1

Respuesta:

$(x + 10) + (x + 20) + 90 = 360 \\ x + 10 + x + 20 + 90 = 360 \\ 2x + 120 = 360 \\ 2x = 360 - 120 \\ 2x = 240 \\ x = \frac{240}{2} \\ x = 120$