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2x-5x=-11-7
-3x=-18
x=6
X+3 = 6+3 = 9
2x - 2x + 7 = 5x - 2x -11
7 = 3x - 11
7 + 11 = 3x - 11 + 11
18 = 3x
18 : 3 = x
6 = x
Jadi nilai x + 3 adalah 6 + 3 = 9