book Maths Puzzle Numerical Ability

I need help with

4x+-9=7x+12

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book Other Question

Write solution as a coordinate. Then graph on the graph provided and label the solution. Label the x and y axis for each problem.

x+3y=-5
2x-3y=8

PLEASE HELP! Simplify

(x^-3/4 y^1/3)(x^1/2y^1/5)