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12x - 5(2x - 6) = 30 12 x - 10x + 30 = 30 2x = 0, x = 0 y = -6
2x - 10 =30 2x -10 = 30 +10 +10 2x = 40 /2 /2 x = 20
x=6 y=30
2x-5=25 2x=25+5 x=30/2 x=15
x=6.