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b. 12x-15 = 6x+16 => 6x = 31 => x= 5,16
= 10-2x = 8x-20
= 10+20 = -20x+2x
= 30 =-18x
b. 2(4x-5) = 2(3x+8)
= 8x-10 = 6x+16
= 8x-6x = 16+10
= 2x = 26
= x = 26/2 = 13