<span>If the motorbike is doing 45 miles in 15 minutes, it's doing 90 miles in 30 minutes, and 180 miles in 60 minutes. That's 180 mph.</span>
Do the same to the other side
So, 5 x (-3) + 7 = -15 + 7 = - 8 , but not 4;
Then, -3 is not a solution to 5x + 7 = 4;
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