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-81/10 = (-2/7)*x-(7*x)-3 // - (-2/7)*x-(7*x)-3
7*x-((-2/7)*x)-81/10+3 = 0
(2/7)*x+7*x-81/10+3 = 0
51/7*x-51/10 = 0 // + 51/10
51/7*x = 51/10 // : 51/7
x = 51/10/51/7
x = 7/10
x = 7/10
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