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a in (-oo:+oo)
7*a+5 = 4*a-10 // - 4*a-10
7*a-(4*a)+5+10 = 0
7*a-4*a+5+10 = 0
3*a+15 = 0 // - 15
3*a = -15 // : 3
a = -15/3
a = -5
a = -5
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