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a in (-oo:+oo)
4*a+(2/3)*a+10 = 52 // - 52
4*a+(2/3)*a-52+10 = 0
14/3*a-42 = 0 // + 42
14/3*a = 42 // : 14/3
a = 42/14/3
a = 9
a = 9
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