book Maths Puzzle Numerical Ability

I dont understand how you solve equations by using multiplication and division...Can you help me understand it?

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book Other Question
Find the center, vertices, and foci for the ellipse.
9x^2 + 100y^2 = 900 i need help solving 6x+5-7x=10-4x+3 and 5-2(x+5)=3(x-2)-1