(70+80+66+x)/4=70

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Solution for (70+80+66+x)/4=70 equation: 


x in (-oo:+oo)

(x+66+70+80)/4 = 70 // - 70

(x+66+70+80)/4-70 = 0

(x+216)/4-70 = 0

(x+216)/4+(-70*4)/4 = 0

x-70*4+216 = 0

x-64 = 0

(x-64)/4 = 0

(x-64)/4 = 0 // * 4

x-64 = 0

x-64 = 0 // + 64

x = 64

x = 64

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