1/2(x-21)=3(10-3)*9

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Solution for 1/2(x-21)=3(10-3)*9 equation: 


x in (-oo:+oo)

(1/2)*(x-21) = 3*9*(10-3) // - 3*9*(10-3)

(1/2)*(x-21)-(3*9*(10-3)) = 0

(1/2)*(x-21)-27*(10-3) = 0

1/2*(x-21)-189 = 0

1/2*(x-21)-189 = 0

1/2*x-399/2 = 0

1/2*x-399/2 = 0

1/2*x-399/2 = 0 // + 399/2

1/2*x = 399/2 // : 1/2

x = 399/2/1/2

x = 399

x = 399

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