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x in (-oo:+oo)
x-7 = (8/7)*(5-(2*x)) // - (8/7)*(5-(2*x))
x-((8/7)*(5-(2*x)))-7 = 0
(-8/7)*(5-2*x)+x-7 = 0
x-8/7*(5-2*x)-7 = 0
x-8/7*(5-2*x)-7 = 0
23/7*x-7-40/7 = 0
23/7*x-89/7 = 0
23/7*x-89/7 = 0
23/7*x-89/7 = 0 // + 89/7
23/7*x = 89/7 // : 23/7
x = 89/7/23/7
x = 89/23
x = 89/23
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