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a in (-oo:+oo)
(-4/7)*a+a-10 = -214/21 // + -214/21
(-4/7)*a+a-(-214/21)-10 = 0
(-4/7)*a+a+214/21-10 = 0
3/7*a+4/21 = 0 // - 4/21
3/7*a = -4/21 // : 3/7
a = -4/21/3/7
a = -4/9
a = -4/9
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