(3r + 2)(r - 5)
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13r +10 =5r-46 13r-5r=-46-10 8r=-56 8r/8=-56/8 r=-7 use the system of letter one side and numbers one side. also when you move the numeral to the left after the equal sign you need to change the sign if it's positive make it negative, if negative make it positive.
Very interesting !While you're here, how would you like to know what 'r' is ?You can find it like this:-3r - 13r = 2-16r = 2Multiply both sides by -1:16r = -2Divide both sides by 16:r = -2/16 = -1/8