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9\left(2x+3\right)+4\left(3x+4\right)=72\times 10
Multiply both sides of the equation by 36, the least common multiple of 4,9.
18x+27+4\left(3x+4\right)=72\times 10
Use the distributive property to multiply 9 by 2x+3.
18x+27+12x+16=72\times 10
Use the distributive property to multiply 4 by 3x+4.
30x+27+16=72\times 10
Combine 18x and 12x to get 30x.
30x+43=72\times 10
Add 27 and 16 to get 43.
30x+43=720
Multiply 72 and 10 to get 720.
30x=720-43
Subtract 43 from both sides.
30x=677
Subtract 43 from 720 to get 677.
x=\frac{677}{30}
Divide both sides by 30.