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3*x-3 = (2/5)*(5*x+10) // - (2/5)*(5*x+10)
3*x-((2/5)*(5*x+10))-3 = 0
(-2/5)*(5*x+10)+3*x-3 = 0
3*x-2/5*(5*x+10)-3 = 0
3*x-2/5*(5*x+10)-3 = 0
x-4-3 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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