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x in (-oo:+oo)
x-((1/3)*(x+15))+15 = 50 // - 50
x-((1/3)*(x+15))-50+15 = 0
(-1/3)*(x+15)+x-50+15 = 0
x-1/3*(x+15)-50+15 = 0
x-1/3*(x+15)-50+15 = 0
2/3*x-50-5+15 = 0
2/3*x-55+15 = 0
2/3*x-40 = 0
2/3*x-40 = 0
2/3*x-40 = 0 // + 40
2/3*x = 40 // : 2/3
x = 40/2/3
x = 60
x = 60
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