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20+5+30=2\times 8x-12
Multiply both sides of the equation by 10, the least common multiple of 2,5.
25+30=2\times 8x-12
Add 20 and 5 to get 25.
55=2\times 8x-12
Add 25 and 30 to get 55.
55=16x-12
Multiply 2 and 8 to get 16.
16x-12=55
Swap sides so that all variable terms are on the left hand side.
16x=55+12
Add 12 to both sides.
16x=67
Add 55 and 12 to get 67.
x=\frac{67}{16}
Divide both sides by 16.