Division comes before addition, so 2 divided by 3 is 2/3, and 4 divided by 6 is 2/3, and 2/3 + 2/3 =4/3, which is 1 and 1/3.
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this works out as 37 - (5/2) + (4 x 3) = 37 - 2.5 + 12 = 46.5
I assume you wish to simplify the expression (x - 2)/(3x + 9) . (2x + 6)/(2x - 4) = (x - 2)(2x + 6) / [(3x + 9)(2x - 4)] = 2(x - 2)(x + 3) / [6(x + 3)(x - 2)] = 1/3.
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The sum of 3x plus 2 and -4 plus 3 is 3x+1 if the equation is (3x+2)+(-4+3). If they are two separate questions, 3x+2 remains as itself while -4+3=-1.