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a in (-oo:+oo)
(-2/7)*a+4/9 = 100/63 // - 100/63
(-2/7)*a+4/9-(100/63) = 0
(-2/7)*a+4/9-100/63 = 0
-2/7*a-8/7 = 0 // + 8/7
-2/7*a = 8/7 // : -2/7
a = 8/7/(-2/7)
a = -4
a = -4
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