Solve for x
x = \frac{57}{11} = 5\frac{2}{11} \approx 5.181818182
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4x+12+7\left(x+3\right)=90
Use the distributive property to multiply 4 by x+3.
4x+12+7x+21=90
Use the distributive property to multiply 7 by x+3.
11x+12+21=90
Combine 4x and 7x to get 11x.
11x+33=90
Add 12 and 21 to get 33.
11x=90-33
Subtract 33 from both sides.
11x=57
Subtract 33 from 90 to get 57.
x=\frac{57}{11}
Divide both sides by 11.
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