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(x-2)+(3x+9)=19
4x+7=19
4x=19-7
x=12:4=3
kalo salah maafkan maksih
(x-2) + (3x+9) = 19
x - 2 + 3x + 9 = 19
x + 3x -2 + 9 = 19
4x + 7 = 19
4x = 19-7
4x = 12
x = 3