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That depends what you mean by a 36 shirt. Usually it means a size 36 shirt, so the answer depends on the price of such a shirt. If you mean a shirt that costs 36 (dollars, cents, euros, whatever), the answer is 2.52.
x =shirt y =sweater shirt + sweater = $40 x + y = 40 shirt + 12 = the price of the sweater (price of the sweater is $12 more than the shirt) x + 12 = y x + y = 40 x + (x + 12) = 40 2x + 12 = 40 2x + 12 - 12 = 40 - 12 2x = 28 2x / 2 = 28 / 2 x = 14 x = shirt = $14 IF... shirt + sweater = $40 x + y = 40 14 + y = 40 14 + y - 14 = 40 - 14 y = 26 y = sweater = $26
If you mean: -2x+8+20 then it can be simplified to 28-2x
12x - 2x = 10
If you mean: 4 = 2x then the value of x = 2