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5\left(7x+14\right)-3\left(17-3x\right)=90x-5\left(4x+2\right)-75
Multiply both sides of the equation by 15, the least common multiple of 3,5.
35x+70-3\left(17-3x\right)=90x-5\left(4x+2\right)-75
Use the distributive property to multiply 5 by 7x+14.
35x+70-51+9x=90x-5\left(4x+2\right)-75
Use the distributive property to multiply -3 by 17-3x.
35x+19+9x=90x-5\left(4x+2\right)-75
Subtract 51 from 70 to get 19.
44x+19=90x-5\left(4x+2\right)-75
Combine 35x and 9x to get 44x.
44x+19=90x-20x-10-75
Use the distributive property to multiply -5 by 4x+2.
44x+19=70x-10-75
Combine 90x and -20x to get 70x.
44x+19=70x-85
Subtract 75 from -10 to get -85.
44x+19-70x=-85
Subtract 70x from both sides.
-26x+19=-85
Combine 44x and -70x to get -26x.
-26x=-85-19
Subtract 19 from both sides.
-26x=-104
Subtract 19 from -85 to get -104.
x=\frac{-104}{-26}
Divide both sides by -26.
x=4
Divide -104 by -26 to get 4.