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7-(-11) = 5x -2x
18 = 3x
6 = x
nilai x+ 3 adalah 6+3 = 9
2x - 5x = -11 - 7
-3x = -18
x =
⇔ x + 3 ⇒ 6 + 3 = 9
s'mg membantu... :)