(18*1+2*x)/2=19.88

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Solution for (18*1+2*x)/2=19.88 equation: 


x in (-oo:+oo)

(2*x+1*18)/2 = 19.88 // - 19.88

(2*x+1*18)/2-19.88 = 0

(2*x+18)/2-19.88 = 0

(2*x+18)/2+(-19.88*2)/2 = 0

2*x-19.88*2+18 = 0

2*x-21.76 = 0

(2*x-21.76)/2 = 0

(2*x-21.76)/2 = 0 // * 2

2*x-21.76 = 0

2*x-21.76 = 0 // + 21.76

2*x = 21.76 // : 2

x = 21.76/2

x = 10.88

x = 10.88

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