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a in (-oo:+oo)
2*a+3/10 = -237/10 // + -237/10
2*a+3/10-(-237/10) = 0
2*a+3/10+237/10 = 0
2*a+24 = 0 // - 24
2*a = -24 // : 2
a = -24/2
a = -12
a = -12
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