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6 - 4x = 3x - 3 - 1
7x = 10
x =
b) 2,4(x-1) - 4,5 = 3(0,5 - 0,6x)
2,4x - 2,4 - 4,5 = 1,5 - 1,8x
4,2x = 8,4
x = 2