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(1/12)*(x+900) = 80 // - 80
(1/12)*(x+900)-80 = 0
1/12*(x+900)-80 = 0
1/12*(x+900)-80 = 0
1/12*x-5 = 0
1/12*x-5 = 0
1/12*x-5 = 0 // + 5
1/12*x = 5 // : 1/12
x = 5/1/12
x = 60
x = 60
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