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(x+41.3+44.2+45.7)/4 = 45 // - 45
(x+41.3+44.2+45.7)/4-45 = 0
(x+131.2)/4-45 = 0
(x+131.2)/4+(-45*4)/4 = 0
x-45*4+131.2 = 0
x-48.8 = 0
(x-48.8)/4 = 0
(x-48.8)/4 = 0 // * 4
x-48.8 = 0
x-48.8 = 0 // + 48.8
x = 48.8
x = 48.8
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