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3.3ˣ + (6/9).3ˣ = 3ˣ + 8
3.3ˣ + (6/9).3ˣ - 3ˣ = 8
3ˣ.(3 + (6/9) - 1) = 8
3ˣ.(24/9) = 8
3ˣ = (9/24).8
3ˣ = 3
3ˣ = 3¹
x = 1
4x² - 1 = 4(1)² - 1
= 4 - 1
= 3