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4\left(5x+3\right)=3\left(144-5x\right)
Multiply both sides of the equation by 24, the least common multiple of 6,8.
20x+12=3\left(144-5x\right)
Use the distributive property to multiply 4 by 5x+3.
20x+12=432-15x
Use the distributive property to multiply 3 by 144-5x.
20x+12+15x=432
Add 15x to both sides.
35x+12=432
Combine 20x and 15x to get 35x.
35x=432-12
Subtract 12 from both sides.
35x=420
Subtract 12 from 432 to get 420.
x=\frac{420}{35}
Divide both sides by 35.
x=12
Divide 420 by 35 to get 12.