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4*x-20 = -5/2 // + -5/2
4*x-(-5/2)-20 = 0
4*x+5/2-20 = 0
4*x-35/2 = 0 // + 35/2
4*x = 35/2 // : 4
x = 35/2/4
x = 35/8
x = 35/8
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