Solve for x : 2x-15=-2x-7

Bring the x terms onto one side of the equation, and the numbers onto the other, rearranging to get 4x=8divide both sides by 4 to get x=2check answer by subbing x=2 into the equation, such that -11=-11

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Answered by Jack P. Maths tutor

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Solve the simultaneous equations: 2x + y = 18 and x - y = 6


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a)By completing the square, prove the quadratic formula starting from ax^2+bx+c=0, b) hence, or otherwise solve 3x^2 + 7x -2= 9, to 3s.f.


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