0.35x+0.09(x+4)=0.03(12)
Step one try to get the variable (x) alone.
Distribute 0.09 to the x+4 and multiply 0.03 by 12
0.35x+0.09x+0.36=0.36
Combine like terms of x
0.44x+0.36=0.36
Subtract 0.36 from each side
0.44x=0
divide each side by 0.44
x=0
Thats your answer!