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x = 40/7
2. 2 (4 - 5x) = 4 + 5x
8 - 10x = 4 + 5x
-10x - 5x = 4 - 8
-15x = -4
x = 4/15
5. 3/4 (x+5) ≤ 4/5 (2x+4) -- kedua ruas dikali 20
15 (x+5) ≤ 16 (2x+4)
15x + 75 ≤ 32x + 64
15x - 32x ≤ 64 - 75
-17x ≤ -11
x ≥ 11/17
6. 45 + 2x ≤ 5
2x ≤ 5 - 45
2x ≤ - 40
x ≤ - 20
7. 5x + 20 = 40 - 2x
5x + 2x = 40 - 20
7x = 20
x = 20/7
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