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x in (-oo:+oo)
3*x = 7*(2/7-((3/7)*x))-10 // - 7*(2/7-((3/7)*x))-10
3*x-(7*(2/7-((3/7)*x)))+10 = 0
3*x-7*((-3/7)*x+2/7)+10 = 0
3*x-7*(2/7-3/7*x)+10 = 0
3*x-7*(2/7-3/7*x)+10 = 0
6*x-2+10 = 0
6*x+8 = 0
6*x+8 = 0
6*x+8 = 0 // - 8
6*x = -8 // : 6
x = -8/6
x = -4/3
x = -4/3
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