exam Maths Puzzle Numerical Ability

Solve for x

6x+1=6x-8

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exam Other Question

Two isosceles triangles have the same base length. The legs of one of the triangles are twice as long as the legs of the other. Find the lenghts of the sides of the triangles if solve systems of equations of numbers 1 to 10 by the addition or substraction

3x+2y=5
9x-2y=15