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a(x-3) = 2x+1
ax-3a = 2x+1
ax-2x = 3a+1
x(a-2) = 3a+1
x = (3a+1) / (a-2)
invers dari g(x) ada;ah 3x+1 per x-2
b. a = (2-11x) / (3-7x)
a(3-7x) = 2-11x
3a-7ax = 2-11x
3a-2 = 7ax-11x
3a-2 = x(7a-11)
x = (3a-2) / (7a-11)
invers dari f(x) adalah 3x-2 per 7x-11