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15 x = 30
x = 2
75x - 30 ≤ 100
75x ≤ 130
x ≤ 1,73
5x + 10x = 20 + 10
15x = 30
x = 30/15
x = 2
75x - 30 ≤ 100
75x ≤ 100 + 30
75x ≤ 130
x ≤ 130/75
x ≤ 1 3/5