plis dong yg ini, pake cara ya, bsk TO hehe

12.) 5x-4 +5x-4 + x+3 + x+3 = 70 meter
12x -2 = 70 meter
12x = 72
x = 6
panjang = 5x-4 = (5x6)-4 = 26
lebar = x+3 = (6x3)+3 = 21
luas = panjang x lebar = 26 x 21 = 546