13+2(13x-9x)=3(x+16)
13 + 26x – 18x = 3x + 48
26x – 18x – 3x = 48 – 13
5x = 35
x = 7
25t-5(2t-4)-1=80-(t+1)+t
25t – 10t + 20 – 1 = 80 – t – 1 + t
25t – 10t + t – t = – 1 + 80 + 1 – 20
15t = 60
t = 4
61+5(x-4)-2(4x+5)=2(2x+5)
61 + 5x – 20 – 8x – 10 = 4x + 10
5x – 8x – 4x = 10 + 10 + 20 – 61
-7x = -21
x = 3
13+2(13x-9x)=3(x+16)
13 + 26x – 18x = 3x + 48
26x – 18x – 3x = 48 – 13
5x = 35
x = 7
25t-5(2t-4)-1=80-(t+1)+t
25t – 10t + 20 – 1 = 80 – t – 1 + t
25t – 10t + t – t = – 1 + 80 + 1 – 20
15t = 60
t = 4
61+5(x-4)-2(4x+5)=2(2x+5)
61 + 5x – 20 – 8x – 10 = 4x + 10
5x – 8x – 4x = 10 + 10 + 20 – 61
-7x = -21
x = 3