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(-1/5)*(10*x-20)+x-42 = 0
x-1/5*(10*x-20)-42 = 0
x-1/5*(10*x-20)-42 = 0
4-x-42 = 0
-x-38 = 0
-x-38 = 0
-x-38 = 0 // + 38
-x = 38 // * -1
x = -38
x = -38
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