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6\left(3x+7\right)-4\left(2x+4\right)=3\left(3x+4\right)+60
Multiply both sides of the equation by 12, the least common multiple of 2,3,4.
18x+42-4\left(2x+4\right)=3\left(3x+4\right)+60
Use the distributive property to multiply 6 by 3x+7.
18x+42-8x-16=3\left(3x+4\right)+60
Use the distributive property to multiply -4 by 2x+4.
10x+42-16=3\left(3x+4\right)+60
Combine 18x and -8x to get 10x.
10x+26=3\left(3x+4\right)+60
Subtract 16 from 42 to get 26.
10x+26=9x+12+60
Use the distributive property to multiply 3 by 3x+4.
10x+26=9x+72
Add 12 and 60 to get 72.
10x+26-9x=72
Subtract 9x from both sides.
x+26=72
Combine 10x and -9x to get x.
x=72-26
Subtract 26 from both sides.
x=46
Subtract 26 from 72 to get 46.