Решение смотри на фотографии
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9 + 13x = 35 + 26x
-13x = 35 - 9
-13x = 26
x=-2
7/9x + 3 = 2/3x +5
7/9*x - 2/3*x = 2
2/3*x домножаешь на 3
7/9*x - 6/9*x = 2
1/9x = 2
x= 2 : 1/9
x=18
(2/3*1/3-1)*1,5^2-1/4=(2/9-1)*1,5^2-1/4=(-7/9)*1,5^2-1/4=-7/9*(3/2)^2-1/4=-7/9*9/4-1/4=-7*1/4-1/4=-7/4-1/4=-2