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(1/2)*(10*x+2)+21 = 0
1/2*(10*x+2)+21 = 0
1/2*(10*x+2)+21 = 0
5*x+22 = 0
5*x+22 = 0
5*x+22 = 0 // - 22
5*x = -22 // : 5
x = -22/5
x = -22/5
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