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12x - 16 = x - 20
12x - x = 16 - 20
11 x = - 4
x = - 4/11
=> 6x - 1/2x = -10+8
=> 11/2x = -2
=> x = -2 ÷ 11/2
=> x = -2 x 2/11
=> x = -4/11
jadi x nya adalah -4/11