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(7x - 6) = 6²
7x = 36 + 6
7x = 42
x = 6
68) √(x + 2) = 5
(x + 2) = 25
x = 23
69) √(y + 2) - 3 = 7
√(y + 2) = 10
y + 2 = 100
y = 98
70) ∛(m - 5) = 3
m - 5 = 27
m = 32
71) 3√(x) = 9
√(x) = 27
x = 729
72) ∛(a - 3) + 9 = 7
∛(a - 3) = -2
a - 3 = -8
a = -5