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x in (-oo:+oo)
(-1/2)*(x-4)+(1/7)*(x+7) = x-4 // - x-4
(-1/2)*(x-4)+(1/7)*(x+7)-x+4 = 0
1/7*(x+7)-1/2*(x-4)-x+4 = 0
1/7*(x+7)-1/2*(x-4)-x+4 = 0
3-5/14*x-x+4 = 0
3-19/14*x+4 = 0
7-19/14*x = 0
7-19/14*x = 0
7-19/14*x = 0 // - 7
-19/14*x = -7 // : -19/14
x = -7/(-19/14)
x = 98/19
x = 98/19
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