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=5x+20 = x+4
= 5x-x = 4-20
= 4x = -16
= x = -16/4 = -4
2) (3x-4)-(4x+3)=2x-1
= 3x-4-4x+3 =2x-1
= 3x-4x-4-3 = 2x-1
= -1x-7 = 2x-1
= -1x-2x = -1+7
= -3x = 6
= x = 6/-3 = -2
4) f . 2/3 = 120 × 4
= f . 2/3= 480
= f = 480 : 2/3
= f = 480 × 3/2
= f = 720
5) 40x = 150 . 8/3
= 40x= 400
= x = 400/40
= x = 10
maaf no 3 pulang,maaf ya