exam Maths Puzzle Numerical Ability

Find the value of x in the equation 5x+20=4x+30

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exam Other Question

Hello, I forgot to include the problem: "use the synthetic division to determine whether the first polynomial is a factor of the second. Show your work and state yes or no"

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I worked this out sqrt(3x+3)- 9 = 0; I came up with x=2 and checking the problem by plugging 2 in, I came up with 81 not = to 9. Can someone advise please?