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2x-5x = -5 -7
-3x = -12
x = -12/-3
x = 4
jdi x - 1 = 4-1 = 3
2x - 5x = -5 - 7
-3x = -12
x = 4
x - 1
4 - 1 = 3
maaf kalo salah semoga membantu ya ^_^