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a in (-oo:+oo)
2*a+7 = 52-7*a // - 52-7*a
2*a-(-7*a)-52+7 = 0
2*a+7*a-52+7 = 0
9*a-45 = 0 // + 45
9*a = 45 // : 9
a = 45/9
a = 5
a = 5
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