exam Maths Puzzle Numerical Ability

ok here is my problem

6x+3=2x+11

now what do i do with it. ive tried everything and cant seem to get the right answer. Plz help

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exam Other Question

Please help me solve this equation:
(x^2)+(sqrt22)(x)=0

Thank you! In a right triangle, the hypotenuse is 1 foot more than twice the shortest side. The other side is 1 foot less than twice the shortest side. What is the length of the shortest side?