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a in (-oo:+oo)
(4/7)*a+(3/4)*a+3 = 205/56 // - 205/56
(4/7)*a+(3/4)*a-(205/56)+3 = 0
(4/7)*a+(3/4)*a-205/56+3 = 0
37/28*a-37/56 = 0 // + 37/56
37/28*a = 37/56 // : 37/28
a = 37/56/37/28
a = 1/2
a = 1/2
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