WILL AWARD BRAINLIEST!! 15 POINTS!!

(1) −(−2−5x)+(−2)=18
x=
(2) −3−3/4(c−4)=5/4
c=
(3) 1/2n+3/4n=1/2
n=
(4) 0.7n+0.8n=2.1
n=
(5) 4/5(2x+5)−4=1
x=