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135=5\left(5x+1\right)-3\left(3x-6\right)
Multiply both sides of the equation by 15, the least common multiple of 3,5.
135=25x+5-3\left(3x-6\right)
Use the distributive property to multiply 5 by 5x+1.
135=25x+5-9x+18
Use the distributive property to multiply -3 by 3x-6.
135=16x+5+18
Combine 25x and -9x to get 16x.
135=16x+23
Add 5 and 18 to get 23.
16x+23=135
Swap sides so that all variable terms are on the left hand side.
16x=135-23
Subtract 23 from both sides.
16x=112
Subtract 23 from 135 to get 112.
x=\frac{112}{16}
Divide both sides by 16.
x=7
Divide 112 by 16 to get 7.