If that's the equation 6r + 7 = 13 + 7r, r = -6
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-20 + 13 = -7
13 x (15 + 7) ie 13 x 22 = 286 or 13 x 15 = 195, 13 x 7 = 91, 195 + 91 = 286
yes.
you need to reorder the problem by manipulating the numbers -2x-7=-x+13 group your variables and constants thus -x-2x=7+13 simplify -3x=20 simplify again x=-20/3
well... order of operations... says 7 + (2x3) - (5x2) which is 7 + 6 - 10 simplified as 13 - 10