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7\left(2x+3\right)=5\left(3x-4\right)
Multiply both sides of the equation by 35, the least common multiple of 5,7.
14x+21=5\left(3x-4\right)
Use the distributive property to multiply 7 by 2x+3.
14x+21=15x-20
Use the distributive property to multiply 5 by 3x-4.
14x+21-15x=-20
Subtract 15x from both sides.
-x+21=-20
Combine 14x and -15x to get -x.
-x=-20-21
Subtract 21 from both sides.
-x=-41
Subtract 21 from -20 to get -41.
x=41
Multiply both sides by -1.