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7\left(x+7\right)+3\left(x+2\right)=42
Multiply both sides of the equation by 21, the least common multiple of 3,7.
7x+49+3\left(x+2\right)=42
Use the distributive property to multiply 7 by x+7.
7x+49+3x+6=42
Use the distributive property to multiply 3 by x+2.
10x+49+6=42
Combine 7x and 3x to get 10x.
10x+55=42
Add 49 and 6 to get 55.
10x=42-55
Subtract 55 from both sides.
10x=-13
Subtract 55 from 42 to get -13.
x=\frac{-13}{10}
Divide both sides by 10.
x=-\frac{13}{10}
Fraction \frac{-13}{10} can be rewritten as -\frac{13}{10} by extracting the negative sign.