exam Maths Puzzle Numerical Ability

2(x - 3) - 3(x + 5)= 3(x - 2)- 7

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exam Other Question

Solve Proportions: 9/-15 = -27/P
My question is: If just the demonitor or just the numerator is a negative number does this make the entire fraction negative?

Thank you for your help,
Brooke find the slope of the line passing through the points (7,-1)and (10,-1)

m= -1(-1)/7-10 = -1+1/7-10= 1/3

Just double checking to see if I did this right.