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3x + (4-x)/5 = x - 1 /*5
15x + 4 - x = 5x - 5
14x - 5x = -5 - 4
9x = -9 /:9
x = -1
2.
5(3-x) + (x-3)/2 = 4x + 5 /*2
10(3-x) + (x-3) = 8x + 10
30 - 10x + x - 3 = 8x + 10
-9x - 8x = 10 - 27
-17x = -17 /:(-17)
x = 1
3.
2(5-x) - (7-x)/2 = x - 1 /*2
4(5-x) - (7-x) = 2x - 2
20 - 4x - 7 + x = 2x - 2
-3x - 2x = -2 - 13
-5x = -15 /:(-5)
x = 3