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a in (-oo:+oo)
(1/2)*a+3/5 = -7/10 // + -7/10
(1/2)*a+3/5-(-7/10) = 0
(1/2)*a+3/5+7/10 = 0
1/2*a+13/10 = 0 // - 13/10
1/2*a = -13/10 // : 1/2
a = -13/10/1/2
a = -13/5
a = -13/5
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