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a in (-oo:+oo)
(6/5)*a+10 = (7/6)*a+12 // - (7/6)*a+12
(6/5)*a-((7/6)*a)-12+10 = 0
(6/5)*a+(-7/6)*a-12+10 = 0
1/30*a-2 = 0 // + 2
1/30*a = 2 // : 1/30
a = 2/1/30
a = 60
a = 60
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