exam Maths Puzzle Numerical Ability

Not sure how to to solve this, transforming equations.
-300=15x
I got x=20
Please and Thank You=)

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exam Other Question

y=3/2x
y=-x+5 1.find the slope of each line that has a slope
A)the x-axis
B)y=-4

2.find an eq. in slope -intercept form where possible
C)x-intercept-2, y-intercept4
D)thru (-1,4), paralle