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a in (-oo:+oo)
a = (1/3)*a+160 // - (1/3)*a+160
a-((1/3)*a)-160 = 0
a+(-1/3)*a-160 = 0
2/3*a-160 = 0 // + 160
2/3*a = 160 // : 2/3
a = 160/2/3
a = 240
a = 240
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