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50-5\left(30-2x\right)=3x+4-20
Multiply both sides of the equation by 10, the least common multiple of 2,10.
50-150+10x=3x+4-20
Use the distributive property to multiply -5 by 30-2x.
-100+10x=3x+4-20
Subtract 150 from 50 to get -100.
-100+10x=3x-16
Subtract 20 from 4 to get -16.
-100+10x-3x=-16
Subtract 3x from both sides.
-100+7x=-16
Combine 10x and -3x to get 7x.
7x=-16+100
Add 100 to both sides.
7x=84
Add -16 and 100 to get 84.
x=\frac{84}{7}
Divide both sides by 7.
x=12
Divide 84 by 7 to get 12.