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(3/4)*(4*x+30) = 18 // - 18
(3/4)*(4*x+30)-18 = 0
3/4*(4*x+30)-18 = 0
3/4*(4*x+30)-18 = 0
3*x+9/2 = 0
3*x+9/2 = 0
3*x+9/2 = 0 // - 9/2
3*x = -9/2 // : 3
x = -9/2/3
x = -3/2
x = -3/2
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