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(3/10)*x-(1/5) = -2 // + 2
(3/10)*x-(1/5)+2 = 0
(3/10)*x-1/5+2 = 0
3/10*x+9/5 = 0 // - 9/5
3/10*x = -9/5 // : 3/10
x = -9/5/3/10
x = -6
x = -6
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