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a in (-oo:+oo)
(1/5)*(a+750) = 350 // - 350
(1/5)*(a+750)-350 = 0
1/5*(a+750)-350 = 0
1/5*(a+750)-350 = 0
1/5*a-200 = 0
1/5*a-200 = 0
1/5*a-200 = 0 // + 200
1/5*a = 200 // : 1/5
a = 200/1/5
a = 1000
a = 1000
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