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7+(-2√6) = a+b√6
maka nilai a = 7 dan nilai b = -2
-a = -7+2√6 + b√6
-a = -7 + (2+b)√6
-a + (2+b)√6 = -7 + (2+b)√6
-a = -7
a = 7
⇒ subtitusi nilai a
7-2√6 = a+b√6 ⇒ -b√6 = 7-7+2√6
-b√6 = 2√6
-b = 2√6/√6
b = -2