if 4x=25 then find 4x-10+15
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4x = 25 .....(i)
= (4x) - 10 +15
= 25 - 10 +15
= 40 - 10
= 30
= (4x) - 10 +15
= 25 - 10 +15
= 40 - 10
= 30
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