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x in (-oo:+oo)
x/7 = (2*x)/63+4 // - (2*x)/63+4
x/7-((2*x)/63)-4 = 0
x/7+(-2/63)*x-4 = 0
1/9*x-4 = 0 // + 4
1/9*x = 4 // : 1/9
x = 4/1/9
x = 36
x = 36
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