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a in (-oo:+oo)
1-((3/7)*a) = (-3/4)*a+79/70 // - (-3/4)*a+79/70
1-((3/7)*a)-((-3/4)*a)-(79/70) = 0
(-3/7)*a+(3/4)*a-79/70+1 = 0
9/28*a-9/70 = 0 // + 9/70
9/28*a = 9/70 // : 9/28
a = 9/70/9/28
a = 2/5
a = 2/5
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