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3\times 4\left(3x+6\right)+45=5\times 2\left(2x+5\right)-45x
Multiply both sides of the equation by 15, the least common multiple of 5,3.
12\left(3x+6\right)+45=5\times 2\left(2x+5\right)-45x
Multiply 3 and 4 to get 12.
36x+72+45=5\times 2\left(2x+5\right)-45x
Use the distributive property to multiply 12 by 3x+6.
36x+117=5\times 2\left(2x+5\right)-45x
Add 72 and 45 to get 117.
36x+117=10\left(2x+5\right)-45x
Multiply 5 and 2 to get 10.
36x+117=20x+50-45x
Use the distributive property to multiply 10 by 2x+5.
36x+117=-25x+50
Combine 20x and -45x to get -25x.
36x+117+25x=50
Add 25x to both sides.
61x+117=50
Combine 36x and 25x to get 61x.
61x=50-117
Subtract 117 from both sides.
61x=-67
Subtract 117 from 50 to get -67.
x=\frac{-67}{61}
Divide both sides by 61.
x=-\frac{67}{61}
Fraction \frac{-67}{61} can be rewritten as -\frac{67}{61} by extracting the negative sign.