Just make the numbers all have a decimal point, then create your sum as so....
4.6
6.7
+2.0
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13.3
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117
(25 +21) * 2 = 92 25 + (21 * 2) = 67
x - 2 = 4x + 46-2 = 3x + 46-48 = 3xx = -48/3 or -16
(46 + 88)/2 = 67
The answer is 82. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.