It can be simplified to: -1d-20 or as -d-20
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15d + 7 = 7d + 15 is an equation in one variable, d.
49 - 14d
14d + 20e
12d -9 = 15d +9subtract 12d from each side and add 9 to each side0= 3ddivide by 3 on each side0 = d.because if zero is in the numerator or dominator it makes the faction 0.
To solve for x, we'd have to know what this expression equals.