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0,6x - 0,4x = 1,2 + 0,3
0,2x = 1,5
x = 1,5 : 0,2
x = 7,5
2) 2(3x - 2) - 5x = 2(x - 3) + 9
6x - 4 - 5x = 2x - 6 + 9
6x - 5x - 2x = 9 - 6 + 4
- 1x = 7
x = 7 : -1
x = - 7