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20 = 2(5x -3 + 3x -1)
20 = 2(8x - 4)
20 = 16x - 8
20+8 = 16x
28= 16x
28 : 16 = x
1,75 = x
5x - 3 = 5(1,75) - 3 = 5,75
3x - 1 = 3(1,75) - 1 = 4,25