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a in (-oo:+oo)
a-((5/7)*a)+2/3 = 122/147 // - 122/147
a-((5/7)*a)+2/3-(122/147) = 0
a+(-5/7)*a+2/3-122/147 = 0
2/7*a-8/49 = 0 // + 8/49
2/7*a = 8/49 // : 2/7
a = 8/49/2/7
a = 4/7
a = 4/7
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