cx+b/d=y for b
Subtract cx from each side to isolate b/d:
cx - cx + b/d = y - cx
Cancel the cx terms on each side:
b/d = y - cx
Cross multiply:
b = d(y - cx)
Subtract cx from each side to isolate b/d:
cx - cx + b/d = y - cx
Cancel the cx terms on each side:
b/d = y - cx
Cross multiply:
b = d(y - cx)