3(5x+1)-12=7(x+1
Solve for x
x=2
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15x+3-12=7\left(x+1\right)
Use the distributive property to multiply 3 by 5x+1.
15x-9=7\left(x+1\right)
Subtract 12 from 3 to get -9.
15x-9=7x+7
Use the distributive property to multiply 7 by x+1.
15x-9-7x=7
Subtract 7x from both sides.
8x-9=7
Combine 15x and -7x to get 8x.
8x=7+9
Add 9 to both sides.
8x=16
Add 7 and 9 to get 16.
x=\frac{16}{8}
Divide both sides by 8.
x=2
Divide 16 by 8 to get 2.
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