1 - 2x ≤ 28 - 53x / 27 = 27 - 54x ≤ 28 - 53x = -54x + 53x ≤ 28 - 27 = -x ≤ 28 - 27 = -x ≤ 1 = x ≥ -1
0,1x + 3 < 13 - 0,7x / 3 = 1/10x + 3 < 13 - 7/10x / 3 = 1/10x + 3 < 130-7x / 10 / 3 = 1/10x + 3 < 130 - 7x / 30 = 3x + 90 < 130 - 7x = 3x + 7x < 130 - 90 = 10x < 40 = x < 4
/ - дробная черта.
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1 - 2x ≤ 28 - 53x / 27 = 27 - 54x ≤ 28 - 53x = -54x + 53x ≤ 28 - 27 = -x ≤ 28 - 27 = -x ≤ 1 = x ≥ -1
0,1x + 3 < 13 - 0,7x / 3 = 1/10x + 3 < 13 - 7/10x / 3 = 1/10x + 3 < 130-7x / 10 / 3 = 1/10x + 3 < 130 - 7x / 30 = 3x + 90 < 130 - 7x = 3x + 7x < 130 - 90 = 10x < 40 = x < 4
/ - дробная черта.