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x in (-oo:+oo)
(-1/8)*(x+16)+(1/7)*(x+7) = x+4 // - x+4
(-1/8)*(x+16)+(1/7)*(x+7)-x-4 = 0
1/7*(x+7)-1/8*(x+16)-x-4 = 0
1/7*(x+7)-1/8*(x+16)-x-4 = 0
1/56*x-x-4-1 = 0
-55/56*x-4-1 = 0
-55/56*x-5 = 0
-55/56*x-5 = 0
-55/56*x-5 = 0 // + 5
-55/56*x = 5 // : -55/56
x = 5/(-55/56)
x = -56/11
x = -56/11
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