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15\left(x-3\right)-6\left(x+3\right)=-100
Multiply both sides of the equation by 30, the least common multiple of 2,5,3.
15x-45-6\left(x+3\right)=-100
Use the distributive property to multiply 15 by x-3.
15x-45-6x-18=-100
Use the distributive property to multiply -6 by x+3.
9x-45-18=-100
Combine 15x and -6x to get 9x.
9x-63=-100
Subtract 18 from -45 to get -63.
9x=-100+63
Add 63 to both sides.
9x=-37
Add -100 and 63 to get -37.
x=\frac{-37}{9}
Divide both sides by 9.
x=-\frac{37}{9}
Fraction \frac{-37}{9} can be rewritten as -\frac{37}{9} by extracting the negative sign.