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x in (-oo:+oo)
(-1/4)*x+1/5 = (-6/7)*x+89/20 // - (-6/7)*x+89/20
(-1/4)*x-((-6/7)*x)+1/5-(89/20) = 0
(-1/4)*x+(6/7)*x+1/5-89/20 = 0
17/28*x-17/4 = 0 // + 17/4
17/28*x = 17/4 // : 17/28
x = 17/4/17/28
x = 7
x = 7
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