This cannot be solved for numerical answers. There must be 2 equations if there are 2 variables.
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divide 20 by 10 which equals 2 the times 2 by 2 which equals 4
36 -20 = 16
To solve for x, we'd have to know what this expression equals.
6x-20 = 8x 6x-8x = 20 -2x = 20 x = -10
40