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3\left(3x+16\right)+7\left(2x+7\right)=42x+21
Multiply both sides of the equation by 21, the least common multiple of 7,3.
9x+48+7\left(2x+7\right)=42x+21
Use the distributive property to multiply 3 by 3x+16.
9x+48+14x+49=42x+21
Use the distributive property to multiply 7 by 2x+7.
23x+48+49=42x+21
Combine 9x and 14x to get 23x.
23x+97=42x+21
Add 48 and 49 to get 97.
23x+97-42x=21
Subtract 42x from both sides.
-19x+97=21
Combine 23x and -42x to get -19x.
-19x=21-97
Subtract 97 from both sides.
-19x=-76
Subtract 97 from 21 to get -76.
x=\frac{-76}{-19}
Divide both sides by -19.
x=4
Divide -76 by -19 to get 4.