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a in (-oo:+oo)
2*a-3*a-7 = -45/7 // + -45/7
2*a-3*a-(-45/7)-7 = 0
2*a-3*a+45/7-7 = 0
-a-4/7 = 0 // + 4/7
-a = 4/7 // * -1
a = -4/7
a = -4/7
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