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7\left(x+6\right)+3\left(x+8\right)=42
Multiply both sides of the equation by 21, the least common multiple of 3,7.
7x+42+3\left(x+8\right)=42
Use the distributive property to multiply 7 by x+6.
7x+42+3x+24=42
Use the distributive property to multiply 3 by x+8.
10x+42+24=42
Combine 7x and 3x to get 10x.
10x+66=42
Add 42 and 24 to get 66.
10x=42-66
Subtract 66 from both sides.
10x=-24
Subtract 66 from 42 to get -24.
x=\frac{-24}{10}
Divide both sides by 10.
x=-\frac{12}{5}
Reduce the fraction \frac{-24}{10} to lowest terms by extracting and canceling out 2.