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5x = 5 atau 5x = 1
x =1 atau x = 1/5
6.
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7. 49 (2x+3)² = (x-4)²
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x - 4 = 7 (2x+3) atau x-4 = -7 (2x+3)
x - 4 = 14x+21 x - 4 = -14x - 21
x-14x = 21+4 x + 14x = -21 + 4
-13 x = 25 15x = -17
x = - 25/13 x = - 17/15