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kondisi 1 .... 2x/3 + 4 = 1/7
2x +12 =3/7
2x = 3/7-12
x = 3/14 -6 = (3-84)/14 = - 81/14 = -5 11/14
kondisi 2
-(2x/3+4) = 1/7
2x/3+4 = - 1/7
2x =- 3/7 - 12
x= -3/14 =6 = (-3-84)/14=-87/14 = -6 3/ 14