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a in (-oo:+oo)
(-2/5)*a-7 = -59/5 // + -59/5
(-2/5)*a-(-59/5)-7 = 0
(-2/5)*a+59/5-7 = 0
24/5-2/5*a = 0 // - 24/5
-2/5*a = -24/5 // : -2/5
a = -24/5/(-2/5)
a = 12
a = 12
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