exam Maths Puzzle Numerical Ability

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2/3x^4 - 1/3x^2y + a/2x^3p

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let me see if I have this correct?
7x-5+3x=6+x-10
7x+3x-5=x+6-10
10x-5=x-4
(10x-5)+(5-x)=(x-4)+(5-x)
(10x-5)+(-x+5)=(-x-4)+(-x+5)
So would -4 be the solution to the equation?

Thank you, Barb Neely
Solve by the elimination method.
3x + 4y = 3
6x + 8y = 6

Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please.