Question

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Answer 1

1) hallar 2x

20 + 30 + x = 90

50 + x = 90

x = 90 - 50

x = 40

2x = 40(2)

2x = 80

2) hallar x

x + x + 4x + x + 10 + x + 10 = 180

8x + 20 = 180

8x = 180 - 20

8x = 160

x = 160/8

x = 20