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3\left(7x+5\right)-2\left(3x+4\right)=30
Multiply both sides of the equation by 6, the least common multiple of 2,3.
21x+15-2\left(3x+4\right)=30
Use the distributive property to multiply 3 by 7x+5.
21x+15-6x-8=30
Use the distributive property to multiply -2 by 3x+4.
15x+15-8=30
Combine 21x and -6x to get 15x.
15x+7=30
Subtract 8 from 15 to get 7.
15x=30-7
Subtract 7 from both sides.
15x=23
Subtract 7 from 30 to get 23.
x=\frac{23}{15}
Divide both sides by 15.