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(1/5)*(35*x+45)-7 = (-1/3)*(15*x-27) // - (-1/3)*(15*x-27)
(1/5)*(35*x+45)-((-1/3)*(15*x-27))-7 = 0
(1/5)*(35*x+45)+(1/3)*(15*x-27)-7 = 0
1/5*(35*x+45)+1/3*(15*x-27)-7 = 0
1/5*(35*x+45)+1/3*(15*x-27)-7 = 0
12*x-7 = 0
12*x-7 = 0
12*x-7 = 0 // + 7
12*x = 7 // : 12
x = 7/12
x = 7/12
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