Bonsoir,
(x-6) + (10x-5) + (-6x+8) + (x+10) = 6x+7
(-2x-10) + (7x-1) + (7x-10) + (10x+2) = 22x-19
(6x+7) + (22x-19) = 28x-12
(x-6) + (-2x-10) = -x-16
(10x-5) + (7x-1) = 17x-6
(-6x+8) + (7x-10) = x-2
(x+10) + (10x+2) = 11x+12
(-x-16) + (17x-6) + (x-2) + (11x+12) = 28x-12
