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4a-9a=5a

We move all terms to the left:

4a-9a-(5a)=0

We add all the numbers together, and all the variables

-10a=0

a=0/-10

a=0

| (2x-1)=5(3x+2) | | 900=5m-10 | | 160=0.75x | | 175=0.75x | | 9^2+b^2=14^2 | | -2x+(19-2x)=-21 | | 3(x-0.5x)+12=3 | | x/4=4.41 | | 2^5x+10=(1/32)^3 | | 4^2x+3=81 | | 3/5x-3=3 | | 0.4x-5.8=6.2 | | Y=3m-10 | | X+(x-3)+2(x-3)=107 | | 10x-45/x=5 | | (7/3)t=84 | | 6x^2-42x+40=0 | | Y-(-2)=-2/5(x-1) | | 4(0.8f-0.5)=0.4 | | 2^3x*5^3x=100 | | 5.4/x=3 | | -0.25x=4 | | 162+54+(x)=180 | | 126+(x)=180 | | 74+49+(3x)=180 | | 14y+12=600 | | 75+50+(3x+4)=180 | | 76+(4x+3)+(4x-11)=180 | | 42+(4x+16)=180 | | 104+28+(4x-8)=180 | | 6x+9-21=0 | | 9=-12+3/5x |

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