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There must be a process in math calculation in grade three.
( 1)

5x？ - 125=0

5x？ = 125

x？ =25

x= 5

(2)

2x？ -4x=3

2x？ -4x-3=0

x=(4 √( 16+24))/4

x =(4 ^ 2√ 10)/4

x 1=(2+√ 10)/2

x2=(2-√ 10)/2

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