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1. x = 22 / ( -7 - 12 ) + 4 / ( 2 + 10 )
2. x = - 4 + (-8) + (-2)
3. x = 2/5 + (- 5/2) +10
4. x = e^10 - Ln (2)

x = 2,6

x = - 4 - 8 - 2

x = 2 / 5 - 5 / 2 + 10

x = 4 /12 - 22 / 19

x = 7,9

x = -14

x = 22026,5 + 0,7

x = 22025,77