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4\sqrt{25}+2x=20
Multiply both sides of the equation by 4, the least common multiple of 2,4.
4\times 5+2x=20
Calculate the square root of 25 and get 5.
20+2x=20
Multiply 4 and 5 to get 20.
2x=20-20
Subtract 20 from both sides.
2x=0
Subtract 20 from 20 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 2 is not equal to 0, x must be equal to 0.