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+5-7x+5= -5+3x+1
-3x-7x = -3x+3x - 4
-10x = -4
-x = -4/10
x = 4/10
x = 2/5
-7x-3x=1-5
-10x=-4
x = -4/-10
x = 2/5 (min dibagi min = plus)