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64. Using cross multiplication we get,
3(x+1) = 4(x-2)
=> 3x + 3 = 4x - 8
=> 3x - 4x = -8 - 3
=> -x = -11
=> x = 11
65. Using cross multiplication we get,
3(2x-1) = 5(3x+1)
6x -6 = 15x + 5
6x - 15x = 5+6
-9x = 11
=> x = -11/9
72. Using cross multiplication we get,
4(3x+2) = -3(2x-3)
12x + 8 = -6x + 9
12x + 6x = 9-8
18x = 1
=> x = 1/18
73. Using cross multiplication we get
3(5x-1) = -2x
15x - 3 = -2x
15x + 2x = 3
17x = 3
=> x = 3/17
74. [2(3t-2) + 3(2t+3)]/6 = t + (7/6)
{6t-4 + 6t+9}/6 = t +(7/6)
using cross multiplication we get,
(12t + 5) = 6t + 6×(7/6)
12t + 5 = 6t + 7
12t - 6t = 7-5
6t = 2
=> t= 2/6 = 1/3
75. 12p+8 - 30p+5 = 2p-16 - 42p+24
-18p+13 = -40p + 8
-18p + 40p = 8 - 13
-22p = - 5
=> p = 5/22
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