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pers. 2 = 4x+7
7x - 8 = 4x + 7
7x = 4x+7+8
7x = 4x+15
3x = 15
x = 5
disubstitusikan x = 5 ke pers. 1 atau pers. 2
ke pers 1
7x+8 = 7(5) -8 = 27
jwbannya 27