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= ...atau
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misal : + + + = x ------ kalikan dengan 2³
+ + 2² + 2³ = 2³ . x
1 + 2 + 4 + 8 = 8x
15 = 8x
x =
= - 1
2x - 10 =
2x - 10 =
2(2x - 10) = 1
4x - 20 = 1
4x = 1 + 20
4x = 21
x =
x = 5
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