book Maths Puzzle Numerical Ability

what does x here equal?
-2.7=-1.3+0.7x

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book Other Question

In an endurance race, Alyson rode her bike 7 miles less than Jeff. Together they rode 39 miles. How far did Jeff Ride? A line is tangent to the circle whose equation is x^+y^+6x-6y-2=0 at the point (1,5). Find the Slope-intercept form of the tangent line.

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