1/2 +7x/10= 13/20

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We need to find the value of x,

1/2 + 7x/10=13/20

7x/10=13/20-1/2=(13-10)/(20)=3/20

Now

7x/10=3/20 (i)

multiply both sides of (i) by 10/7 as shown below

(7x/10)(10/7)=(3/20)(10/7)

x=3/14

as a check

1/2+7/10(3/14)=(70+21)/(140)=91/140=13/20

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