exam Maths Puzzle Numerical Ability

"How do you solve 4x-9=7x+12"

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exam Other Question

x^3y+2x^2y^2+xy^3

I came up with the answer can you let me knwo if i am correct
x(x^2y+y^3+2xy^2)
xy(x^2+y^2+2xy) I need help with the following problem.
Solve the systems of linear equations by using the technique of substitution. If the system is inconsistent or dependent, say so in your a