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3\left(-2\right)x+3+45\left(-x+5\right)=5\left(-5\right)\left(2x+1\right)
Multiply both sides of the equation by 15, the least common multiple of 5,3.
-6x+3+45\left(-x+5\right)=5\left(-5\right)\left(2x+1\right)
Multiply 3 and -2 to get -6.
-6x+3+45\left(-x\right)+225=5\left(-5\right)\left(2x+1\right)
Use the distributive property to multiply 45 by -x+5.
-6x+228+45\left(-x\right)=5\left(-5\right)\left(2x+1\right)
Add 3 and 225 to get 228.
-6x+228+45\left(-x\right)=-25\left(2x+1\right)
Multiply 5 and -5 to get -25.
-6x+228+45\left(-x\right)=-50x-25
Use the distributive property to multiply -25 by 2x+1.
-6x+228+45\left(-x\right)+50x=-25
Add 50x to both sides.
44x+228+45\left(-x\right)=-25
Combine -6x and 50x to get 44x.
44x+45\left(-x\right)=-25-228
Subtract 228 from both sides.
44x+45\left(-x\right)=-253
Subtract 228 from -25 to get -253.
44x-45x=-253
Multiply 45 and -1 to get -45.
-x=-253
Combine 44x and -45x to get -x.
x=253
Multiply both sides by -1.