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2*x+1/10 = -21/30 // + -21/30
2*x+1/10-(-21/30) = 0
2*x+1/10+7/10 = 0
2*x+4/5 = 0 // - 4/5
2*x = -4/5 // : 2
x = -4/5/2
x = -2/5
x = -2/5
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