exam Maths Puzzle Numerical Ability

-9x + 7 +4x = -5x +7

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i didnt know where to ask this question it is for college algebra: solve the system {3x -y+2z=15
x+2y+3z=5
-2x+y-3z=-16 3log_5(3x+1)-2log_5(2x-1)-log_3x