VA ROG AJUTATI-MA E URGENT

stiu doar la 9
a) x = 2/3 = 7/4
x = 7/4 - 2/3
x = 13/12
b) 32 + x/16 = 9/4
4(32 + x) = 9 * 16
4(32 + x) = 144
32 + x = 36
x = 36-32
x = 4