book Maths Puzzle Numerical Ability

how do you solve the problem 3(x-2y)=-12(x+2y)?

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book Other Question

Directions: Graph each function, i need the x and y coordinates for this equation i can graph them myself, but the both the x and y coordinates can't go over 6 or -6

f(x)=-5x sq a car stereo system thet regularly sells for $425 is on sale for $318.75. find the discount rate.