Solve for x:
21x = -147
Hint
Divide each side by 21. Go on, give it a go.
Answer
Solve for y:
15 – (-y) = 20
Two negatives? Pshaw. Change 15 – (-y) to 15 + y.
y = 5
Solve for b:
Be sure you solve for b, not -b.
Try dividing by , or multiplying by the reciprocal . Same diff.
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, or multiplying by the reciprocal 
. Same diff.