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1/3x - 2/3 = 2/3x-13 per 3
dikali silang
3(1/3x - 2/3 )= 2/3x-13
x - 2 = 2/3x-13
13-2 = 2/3x - x
11 = 2x-3x per 3
11 = - 1/3 x
pindah ruas
11 × -3 /1 = x
-33 = x