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4/5-12 = (3/10)*x // - (3/10)*x
4/5-((3/10)*x)-12 = 0
(-3/10)*x+4/5-12 = 0
-3/10*x-56/5 = 0 // + 56/5
-3/10*x = 56/5 // : -3/10
x = 56/5/(-3/10)
x = -112/3
x = -112/3
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