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(1/2)*(4*x+24) = 30 // - 30
(1/2)*(4*x+24)-30 = 0
1/2*(4*x+24)-30 = 0
1/2*(4*x+24)-30 = 0
2*x-18 = 0
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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