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3x - 7x = -8 - 12
-4x = -20
x = -20/-4
x = 5
x + 2 = 5 + 2 = 7
3x-7x= -8-12
-4x= -20
x=-20 : -4 = 5
x nya sudh ketemu 5 jadi 5+2= 7