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a in (-oo:+oo)
2*a-((5/7)*a)-10 = -253/28 // + -253/28
2*a-((5/7)*a)-(-253/28)-10 = 0
2*a+(-5/7)*a+253/28-10 = 0
9/7*a-27/28 = 0 // + 27/28
9/7*a = 27/28 // : 9/7
a = 27/28/9/7
a = 3/4
a = 3/4
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