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5\left(7-30+5b\right)-7=7\left(5\left(7b-6\right)+4\right)-50
Use the distributive property to multiply -5 by 6-b.
5\left(-23+5b\right)-7=7\left(5\left(7b-6\right)+4\right)-50
Subtract 30 from 7 to get -23.
-115+25b-7=7\left(5\left(7b-6\right)+4\right)-50
Use the distributive property to multiply 5 by -23+5b.
-122+25b=7\left(5\left(7b-6\right)+4\right)-50
Subtract 7 from -115 to get -122.
-122+25b=7\left(35b-30+4\right)-50
Use the distributive property to multiply 5 by 7b-6.
-122+25b=7\left(35b-26\right)-50
Add -30 and 4 to get -26.
-122+25b=245b-182-50
Use the distributive property to multiply 7 by 35b-26.
-122+25b=245b-232
Subtract 50 from -182 to get -232.
-122+25b-245b=-232
Subtract 245b from both sides.
-122-220b=-232
Combine 25b and -245b to get -220b.
-220b=-232+122
Add 122 to both sides.
-220b=-110
Add -232 and 122 to get -110.
b=\frac{-110}{-220}
Divide both sides by -220.
b=\frac{1}{2}
Reduce the fraction \frac{-110}{-220} to lowest terms by extracting and canceling out -110.