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7\left(5x-5\right)+84=12
Multiply both sides of the equation by 21, the least common multiple of 3,7.
35x-35+84=12
Use the distributive property to multiply 7 by 5x-5.
35x+49=12
Add -35 and 84 to get 49.
35x=12-49
Subtract 49 from both sides.
35x=-37
Subtract 49 from 12 to get -37.
x=\frac{-37}{35}
Divide both sides by 35.
x=-\frac{37}{35}
Fraction \frac{-37}{35} can be rewritten as -\frac{37}{35} by extracting the negative sign.