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15x = 5
x = 5 ÷ 15 = 1/3
2. (1 + 2a) ÷ 4 = (5 + a) ÷ 5 || dikali 20 masing masing ruas
5 (1 + 2a) = 4(5 + a)
5 + 10a = 20 + 4a
6a = 15
a = 15/6
3. 2x + 3 < 27 + 4x
-2x < 24
x > -12
Himpunan penyelesaian = { -11, - 10, -9 ....}