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1/2x - 4/5x = 4+2
-3/10x = 6
x = 6 x -10/3
x = -20 (a)
kedua ruas dikalikan 10
5(x - 4) = 40 + 8x
5x - 20 = 40 + 8x
5x - 8x = 40 + 20
-3x = 60
x = - 20