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(4/5)*x+4 = (-2/7)*x+1236/385 // - (-2/7)*x+1236/385
(4/5)*x-((-2/7)*x)-(1236/385)+4 = 0
(4/5)*x+(2/7)*x-1236/385+4 = 0
38/35*x+304/385 = 0 // - 304/385
38/35*x = -304/385 // : 38/35
x = -304/385/38/35
x = -8/11
x = -8/11
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