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2/5 x - 7 = ½x - 15/2 --> ×10
4x - 70 = 5x - 75
4x - 5x = -75 + 70
-x = -5
x = 5 (B)
12) 3/2 x + 5 lbh sm dg 5/6 (x + 12)
3/2 x + 5 lbh sm dg 5/6 x + 10 ---> × 6
9x + 30 lbh sm dg 5x + 60
9x - 5x lbh sm dg 60 - 30
4x lbh sm dg 30
x lbh sm dg 7,5 (C)